Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbf98e562819e57…

MALICIOUS

PDF

90.0 KB Created: 2021-06-24 14:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4422b175a26802ee9ece6acc7a82f056 SHA-1: 72eb636a429acb57e6cdf58528decb6a672ea7b3 SHA-256: 8cbf98e562819e57299488665be4fe53bf96a4ff094de116cca8405f83ec409a
156 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. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to potentially malicious or phishing content hosted on these sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160702e1d89e8a---rumadobaraxenozivipad.pdf
    • https://tipresentoio.it/images/file/gakezetubuzadorefupojed.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a9c266e955b40e214e81e5bedd6957de/61056283209.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160884f25dbe5b---lowemipaxo.pdf
    • http://pamat.ro/UserFiles/file/84713986244.pdf
    • http://soldearenales.com/galeria/files/65209010256.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ac073m3f02olck5ci75tn3q3td/42347482533.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a285f1749ce---lunituzona.pdf
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/coo80430d9o0s31m1ei8cslbr1/tajiwebewumizakiwe.pdf
    • https://bedandbreakfastchia.it/userfiles/file/vamakexi.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/48198415669.pdf
    • http://alibabashipping.com/userfiles/file/laxupaxobotunilolitofem.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092731381c19---beketitivafud.pdf
    • http://ezibra.pl/upload//file/lavepajoveluxetigejalib.pdf
    • http://seoulsquare.com/userfiles/file/61104599466.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+be+happy+always+pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011833.bin
b710c9e39f5ac005207096116781a1d6b3879589b6e13bf2500f859c932ef1ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11833 4964 bytes
font_01_sfnt_off00012933.bin
806061a68b5373231d4c76b3adf484451e0a8d1a5c31a1803a505e0a291dd1fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12933 10560 bytes
font_02_sfnt_off00014d48.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D48 4324 bytes

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