Malicious PDF — malware analysis report

Static analysis result for SHA-256 87aa6be76618f667…

MALICIOUS

PDF

87.3 KB Created: 2021-06-30 03:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f34f256fd674c90d8a7307fec02bbd2 SHA-1: 6910e17603e883125327d442c690d36c30c979ab SHA-256: 87aa6be76618f6679d1c4537026f317aa951f19d4432bfcf170a62d8473dd60b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning scheme. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dbaeb5b0dba---tufexuzapuk.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd18b6f18bf---jesukadebajutezusojam.pdf
    • http://adaviestransportltd.com/userfiles/file/kumofewawumutonebulogoso.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce35adf4b---fopulenu.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b05c0ba093e---222312720.pdf
    • http://zjhywt.com/images/upload/File/11692458595.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160915bc48c23c---46217746692.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c01da0a92c1---11149955663.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/f59b4cea655150fa028b079c692a877b/8727183454.pdf
    • http://singer-island-condos.com/userfiles/files/21285193579.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/chbbdjgpbeubjghbasmuvaj9dv/kogaroxudikojodufuda.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/67655441f55eebfb41cb52823574ee29/wujojutewa.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/23601148166.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/071af6db3e6ac09ddd130d7c28c962d0/xepewo.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/v5m7dvu7rlu03acin027lrh2u4/14605398056.pdf
    • https://asthasupermarket.com/userfiles/file/68302188379.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/1c2e1e8483eebb388ff7526186dfcc60/31436972578.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d952969d46---24691707598.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafa9717087---lebipubazi.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2e1221b73---kitipuwugoditux.pdf
    • http://rauvuonsach.com/images/uploads/files/zosijudaki.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c023a2e5605---45526991198.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866152b8861---70351740830.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828b3042bb9---81642143469.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/49052579913.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=tuesday+morning+motivation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f202.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 16792 bytes
font_01_sfnt_off00010a14.bin
6ba004720723de4ef47d28d36454f81c312b54e00a0f88f7633fe1aebde7403b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A14 16876 bytes
font_02_sfnt_off000135a9.bin
d8f0ea0647a42df889e1417636a0257039719e16831158645b8d1ab474d90c32
pdf-font-stream PDF embedded font (sfnt) at offset 0x135A9 10788 bytes