Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bd42bd99d1e620…

MALICIOUS

PDF

90.2 KB Created: 2021-07-03 19:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: abfa4ec832d5391c1c6a4e02b05da078 SHA-1: 26fce516242a89bd3bb57bacddab363d7a73fb40 SHA-256: 93bd42bd99d1e620dcbbd6ab41b89a1e26a2c7e8d1e4b378b549d44ab451b4fb
176 Risk Score

Malware Insights

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

The file was detected as a malicious phishing trojan by ClamAV. Heuristics indicate it functions as a link farm, potentially directing users to malicious content, and specifically employs a callback phishing lure. The document body is heavily obfuscated, preventing a detailed analysis of its specific content, but the presence of numerous links to potentially compromised CMS upload storage and disposable hosting suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://marmarases.com/upload/ckfinder/files/9172508949.pdf In PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/893a234d1b206ce693fcb96f89238c2c/83195672933.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/birizuwamuzigana.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/75311816801.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/panira.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d4dad4e2d77---rexodiruden.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/16959791155.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/bapunitirasexatolar.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/bakutitoga.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/zogipobire.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160e042265f18b---74701929364.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/rosuku.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/bimulesumaziduzeruvoxuj.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c172a9368---kosezimulizikujebivawakov.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608185a058022---74075489385.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/k05bqfralt6i402hk4jlpng452/zirapokazumafuba.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ca7c4f3eb---xawusisipapezakivuto.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/2598174781.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965c30b6fca---56885475590.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4f53419aa---46837953617.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f63886524---lipeturudenosixukitutofex.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/cilv0guppk7859db1dpjr9i3q6/pidadazibuvi.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/sigobudezelufawatizame.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/78410287882.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5n2t9snptph5nrcd2mru922cc4/72111876283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=writer+of+the+hate+you+givePDF 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_off0000fd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11562 10448 bytes
SHA-256: 4a92c1dda033c2bcb4e0131c8977f3b6ae385eff0cfd76d0f42e5817d19c48ee
font_02_sfnt_off00012d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D49 17672 bytes
SHA-256: 3bbe1197d55527292ee92e036978e3ace1d809042ce693788b3b4b5c80218454

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