Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5694d633f27a882…

MALICIOUS

PDF

89.8 KB Created: 2021-09-04 20:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 208862de6b677e70b5a8b095606e530e SHA-1: 89d84e4b6e0bf2ec3962cab719c4a3e18725167f SHA-256: f5694d633f27a8824379cd969d9ca7c90fae9c43ef7f428fef40f03f854dd898
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and other disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it's not intended for user consumption but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/6c2559a505822850c782bec24f86d92c/tetenuw.pdf In PDF document text
    • http://windmill-bv.com/userfiles/files/86944348733.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb8c111316d---mavoso.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/32319340263.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/91822892823.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/29316231915.pdfIn PDF document text
    • https://businesslife.com/content/file/3558288008.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/fugunotev.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/jozaxubevixotososobazo.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/ba8f57eafe3e9764073c3000f57c3a16/rofuzavatatosike.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/kufazedaxurud.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/gakefujuxirur.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/i97i2nebhdqco9g2r9qtkc4ie0/zedozagosunuk.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/zatazabukasufukifasi.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609af788a6702---zipomitodikusojawogigajot.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4ef9bea927---822711811.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/9564111655.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990348dce40---tonitazovarozuvot.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/79920848400.pdfIn PDF document text
    • http://meadclassof1991.com/clients/c/cc/cc689d7a74a098ef67b43942063c7ff9/File/ratokakijeromapejig.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0797c8e9f8---17326705642.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161238dd402087---57273155977.pdfIn PDF document text
    • https://noddy.nu/images/file/wobupozugujaloj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=livros+da+patristica+em+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 20120 bytes
SHA-256: 4b69b9401c7820a0fde39a79045a7d1b696608e85db5120b3085a9290d9ff7b5
font_01_sfnt_off000128d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EB 10656 bytes
SHA-256: fbbd93878a058a0f901eeb9607f521a630340195bfccbb97dc7d6c45f1aa18bf

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