Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb75d225e8ccbc1…

MALICIOUS

PDF

91.4 KB Created: 2021-08-16 05:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 2aa8ed03697796a2563df38a0ca947d6 SHA-1: 2773e357386de2d9fa9c5d2485ed4ff85622852c SHA-256: 7bb75d225e8ccbc12f086ebe6d512aec05b5ef2de6720cedb17e4454bd18918f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Browser Install Lure' heuristic suggests the document attempts to trick the user into installing a malicious browser extension or plugin. Numerous URLs pointing to compromised CMS uploads and disposable hosting were extracted, some of which are likely part of the download infrastructure for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://davidhammerstein.org/userfiles/file/65944880880.pdf In PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/35748633624.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/79516cb4c47649932917c33edfb8b30c/88977218429.pdfIn PDF document text
    • http://www.puhito.hu/uploads/rinapixufu.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/91fb1a40884a6f41a7b98f78f81f9786/vefelamimazebo.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/a43da8f43cd8e64d18d22ab9a20f3647/32503923033.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/85b2452ef242431d9e46557a83cdd801/badozufarazig.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/girovujoma.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/29249611039.pdfIn PDF document text
    • https://istanajp.com/contents//files/xerepitupujirabizajub.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/gikelosu.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/30626220161.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/9c3rje90jdm0itketirrdjeoo6/70412322812.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/ziroxulopewogevavufama.pdfIn PDF document text
    • http://oodow.cn/upload/file/210613212813392940vcfeyl5tltb3.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/oq9ath8i2anjcsgrfnmkq5n8d8/35087194822.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/malanobetukesuzeragirofo.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/938a91e5c2080c9b1f726b1f4a0165a4/kesunelasimed.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/21791067732.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/50059825105.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073779c59c11---3473721210.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/dusumupelubexutubo.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/68071088162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=auto+clicker+for+chromebook+cookie+clickerPDF 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_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11949 17576 bytes
SHA-256: d638d8b5c922622305bb594c8f3958b150f1f062e0844384c59d4b5479d8ba52
font_02_sfnt_off0001471e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471E 10480 bytes
SHA-256: dc6ebdc46259a908890f0d80780087e920c9143f57a11eca858c53acb900b37e

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