Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec4edb9104b48e5…

MALICIOUS

PDF

85.4 KB Created: 2021-07-23 11:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ded9bd3d0106d0c06737c41e2f0e4941 SHA-1: 67c359921dfbd71137e4164627c47a49c8ac2a54 SHA-256: cec4edb9104b48e5f8f2f372451676f3c4d22d4bb2a51549b52258113f5db376
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress installations, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm characteristics strongly supports its role as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad04476a6c8---41597857748.pdf In PDF document text
    • https://gamasteel.net/userfiles/file/bufelin.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/bubujorenep.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/73222814687.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210505201751932.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4qq1m7cfab4st2kgg3kfgkp3dj/mevemiwukijitibed.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/dixasitefoxewagevu.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/vafewasorisi.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/zodul.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/m1btv7e1nimujjvdslv3fnddru/dasadedewawafoziligetoka.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0d0c86dcb---58658416213.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/tesodijofu.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/h1l95tmvoft1tq9bvlv9iabprl/2231677269.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/najotavuwup.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/gofikadibin.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/esr3qgmtlc0kko80qcfffefmcs/puforirer.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b6c87994f4ac4b497372044e2a378470/pateluwij.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b37922a19df70059e0d340af9084493a/tizipulikinalaj.pdfIn PDF document text
    • https://alyansdugunsalonu.com/userfiles/files/dodorodokakaso.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/69127d0ac491de0afedd2ced3778e211/dutugab.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/rexibifokegosurasunibaliv.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5366c81807---xoresuzexuxenugenobota.pdfIn PDF document text
    • https://orangerun.re/photo/files/degetupirup.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/sakejes.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/nugipimafolifukivirunez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=best+font+style+for+happy+birthdayPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE930 10904 bytes
SHA-256: 55985ff9c8c558d759ba04b54b761a5bc76b123e7c401636e84f0490cc2da5d9
font_01_sfnt_off0001022d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3F 16920 bytes
SHA-256: 8be8ab70565361b381725ff9a3af6ca59c8ebd88f5ff05fe2fc03bcc7058dbf8

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