Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a125d255dc0f9c…

MALICIOUS

PDF

88.1 KB Created: 2021-07-07 00:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db4e807d7aef1bc8308e8b9ec03d562d SHA-1: b7e097dd907705aaf23ed285189e4ef9995bd796 SHA-256: e7a125d255dc0f9c45be350f1b0a6dc7d30c65f019b8998a5860e271bb9c9e1d
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. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/354de8471c0920b912920b65a2213861/17495924641.pdf In PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac93a2b7362---karugevusiralur.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/70821545028.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/afcafc2627bb9eaef29ffb9acb66052f/siniro.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ec82cd7d0---jonukamuvajaluzilebobi.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c90f8a3261f---99371650830.pdfIn PDF document text
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/guxipuwajarotojesoparu.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/6439116765.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/1k4pahnneot5tpt3v207d3rk93/45841292043.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c388d851a5c---betepatav.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab65218c803---tavoxutilojitot.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/10424919123.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/a51a9704a4e9853b4abdfb8970e04f62/15037151937.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/252e6d88d32fcd7cdfb8ce851c21c780/89369359141.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/06253300448d58db77e04c8fde226e17/tudukezarusegarib.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/1e7cd638c518827e2b72c7733aa9293d/refigarax.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/serudijule.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b27fb708d8a---jurasapuj.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/ffaa1274c4ab811a0a1156d697af1e6b/borudulibaloru.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9f212ad7a---bomodediropowelofedidox.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/15692366572.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/6b3c13804dbd5a5890ecbe6eb13144ab/jegaxesolexo.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/87046839008.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/zomebowopos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=piazza+san+marco+florencePDF 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_off0000f49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 10460 bytes
SHA-256: fb1a2159250671846fad63a75f17a002616e9a48ee2a0db1f8a7978eef7a6cad
font_01_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12468 18236 bytes
SHA-256: ca287258228a55bd93f7a88f28150494197fbb3eedf87375f5962d539c28bb25