Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a79ae53f34c1ca…

MALICIOUS

PDF

123.5 KB Created: 2021-07-28 07:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 34e8322a0031f1795aa54a56a97fa5eb SHA-1: 2878dc7e995b57a4800747ff3ca1f3fb0ffaf722 SHA-256: 14a79ae53f34c1ca6791e301c0bd0b33fd5e5788594f4943223122a9098f87e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9229

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0f978256a---feriguxikunizuget.pdf In PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/98025581535.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/443e5a231829e9cf03c369d81ee2b722/81139240818.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/butolisenolup.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/n72ugnrctrobdellbbbb6u6edp/tenogupedisasif.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/8ibqajqv22g4phav2vsccj1b33/11650431417.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/29s134nu81rm7e0uis7rldna24/vusoropokare.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/faraxugotibotan.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/42086258807.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094e3133c55a---japuxurekevuda.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/wobiwasubukupavutesigedu.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/95691605812.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf3ef65c1f---77184497714.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8ea297127a66225bc6104498a89dec5f/xerap.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/d6323e9aa89c6e6d79a58a0e7d1d8feb/zosatavakuroxerunafilu.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/9rvgef0rb9ef18250ff4jc555r/lakedexelisilaliw.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077afd3d846b---655748438.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/83371363427.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/nesenokarowisovetumede.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/149e4d5cb7028aca3dc7ecf10b64c3a8/24427427452.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/44765382037.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1ce3e4753d---vimamamabegukeruzexe.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d2f771009---moxapuneropedofo.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/24821462003.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c5984fc55---6491669814.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/7543284654ff6a5137b8b774f6b16fcb/nogumiveso.pdfIn PDF document text
    • https://dx.doi.oIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+murder+of+roger+ackroyd+critical+analysis+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001a830.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A830 18760 bytes
SHA-256: 9d35e0d23b068894b791e4cc9c978496793ebea520584714372a550f0dabb22c
font_00_sfnt_off00014c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C79 3720 bytes
SHA-256: 4406824e3409f716b50e2ccb26a16694899e8109b0dba12608b0bd4c2386ee6b
font_01_sfnt_off00015b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B52 11336 bytes
SHA-256: 72d32d3907d0c147bd1c09ba399e6ac866c4e52fab4b74ad80faf090ab68b342
font_02_sfnt_off0001759c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1759C 20000 bytes
SHA-256: abbd67a54d5312dbb6cf72bf034e33267fccf8288486dee333637c17099e8b64
font_04_sfnt_off0001c687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1