Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c4d294f974a64f…

MALICIOUS

PDF

84.0 KB Created: 2021-07-18 12:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 854c15222ab22bf83538c09f6840d166 SHA-1: 09bd24815de76cb754dc478f5b6c862676d4c5b0 SHA-256: a5c4d294f974a64f97bf088525f8b821da2bb164c34767b334d880b9eb14ac2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external websites hosted on potentially compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bogelaipigeon.com/upload/file/lorupesazevekolebosikux.pdf In PDF document text
    • http://tuzvedo.hu/elemek/file/86527351056.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/d1754489819e59ba62dc0843928e133f/roxanaz.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/50jh99iaq3h3dakmejmdnc3pt5/31415002346.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/zodafewiv.pdfIn PDF document text
    • https://kueapem.com/contents//files/14469614986.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/94139504451.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/jiwoxi.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/02joundm4ctst99h6rdsfh1g0q/soxodutejeguk.pdfIn PDF document text
    • http://minhanh.com/files/fenupegurasepetibexifadit.pdfIn PDF document text
    • http://coffee33.ru/archive/file/48028189188.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/1a8f05f452d9071d187a99f7f0d91849/gutegegizuvu.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/12680397727.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6bcba3d1f---88137453650.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/19460934530.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/43703797858.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/5a1b317e7feeaa7ecb763abffab8920e/92128017857.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/ehkhhq568ah825f1afsk0c87lt/nufenesanovuleget.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/1d6e8ac90c7fa962e92b808a99621ad2/16668890509.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780f3110463---59938906715.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/kuxuroxamadimomitixoja.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/35d1b38c1f3d3ecaaf98d0310279921a/zakejof.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9662219110---nagesijaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=one+ounce+in+gramsPDF 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_off0000e75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75C 10556 bytes
SHA-256: 821d5f3deac3daed3b139e9b68a5e7fffed374b8a1a4a70fe005b1d4c3fb54c3
font_01_sfnt_off0000ff68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF68 16752 bytes
SHA-256: d7d3b3cb6619f461c54a6c758bd392aaef6375b501a89d7d9fcf62eb0fff7c4c
font_02_sfnt_off00012aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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