Malicious PDF — malware analysis report

Static analysis result for SHA-256 700f2f6c21c8b2bb…

MALICIOUS

PDF

92.3 KB Created: 2021-09-05 16:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 57e03d499671d3ee77807f8ccbf6aeef SHA-1: 6297eb9fb161801c1ef8e0d5d3488e6f376b5929 SHA-256: 700f2f6c21c8b2bb5d97146e675b29cb8e090210116a95d3b66adf5f9a5c768d
176 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to external resources, many of which are hosted on compromised CMS upload directories. The presence of PRC/3D content and the use of wkhtmltopdf suggest an attempt to obscure the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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 https://pixomot.ru/uplcv?utm_term=tenda+a9+wireless+n300+universal+range+extender+manual PDF link annotation
    • https://warungmimpishio.com/contents//files/mawebizoxenevewesupiri.pdfIn PDF document text
    • http://vce34.ru/attachments/file/74259568178.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/57960806484.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/jebulatojodafugazaf.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/kavpok0oe21t88nor9fpttfgmi/ruxigusolevanetefuliz.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607860c6d7b63---lelowizo.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/52586728793.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16093b26a2f1ca---68315848073.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/miranu.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/farumixobuderos.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/64410770424.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/ccd4b53d9c606068bf0d8bbcacb38374/voxixu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607852072318e---jaloseruvudejakubo.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/99f22516d36a364da3c4db3fc60901bf/61638048817.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b57d5435c7af5af1b36278ba8322fe93/17986615934.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/18226739217.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a64e4d056---zusixuturi.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/dixosopitozatudopikujukub.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/verufinuma.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/nalerimisavajixuz.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/zeranitosinugaxewad.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/kisoruwi.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/vumoduzunoxegetizugisefaj.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d8fb5606ac876d1b685fe691125db0f2/76931697346.pdfIn PDF document text
    • 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
font_00_sfnt_off0000d26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26E 11248 bytes
SHA-256: 6914100f00efda485966c42e04e8535ac8290f89b9f859a52dcdf00eaed1f464
font_01_sfnt_off0000ecb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 24428 bytes
SHA-256: 74253d7281227e6378cd0d68800b42b2762ff5421d20bfc1757567959123df4f
font_02_sfnt_off00012a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5B 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00013257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00014a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A68 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426

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