Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d121cb6080f4a5…

MALICIOUS

PDF

66.2 KB Created: 2021-09-26 03:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd8499d4b8b1cffd5f05c06bc9959f98 SHA-1: e4b420f9a63b7b17b165d6780f0a6e7e51a99159 SHA-256: b2d121cb6080f4a52f2f0c429dc2f578229c5db5fa44e9006220ea9da5da91c8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, many pointing to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead the user to a phishing or malware download page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8a82e7f72f47ba64ccc1ae5f4d0c0e49/bumorefuligokap.pdf
    • http://davidhammerstein.org/userfiles/file/melexataxo.pdf
    • https://108pizza.pl/uploads/userfiles/files/rosonasasebiganosesamo.pdf
    • http://kpotplace.com/uploads/files/26517928643.pdf
    • http://quimis.net/js/ckfinder/userfiles/files/nudajub.pdf
    • http://drsuthichai.com/userfiles/files/79739644604.pdf
    • https://yasacompany.com/upload/files/kabezofiwisepepe.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/3vht99f5esor824rp6mmdglggr/lenokam.pdf
    • http://beijingteye.com/upload/files/kozemarukadefofijutivi.pdf
    • https://planet-pvc.com/upload/files/watolusup.pdf
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/89163301377.pdf
    • https://la-klamm.org/userfiles/file/38344157172.pdf
    • http://goldendazzle.com/upload/quangtri/files/jojodozox.pdf
    • http://laptopcuhaiphong.vn/upload/files/bigivenafaxojexoxago.pdf
    • http://dungcubepgiangtrinh.com/webroot/img/files/riberubi.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131215781957---rorejalixotamifoxotiru.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+add+another+email+account+on+android+phone
    • 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_off0000a6f0.bin
bb6245cb379d3ac6a6d190fd6635c7a415b107fb1995604bef39421016715487		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6F0 10788 bytes
font_01_sfnt_off0000bf83.bin
c4a2c28863ceaaa7cf8b511eb6d6e7e99ee10ba6a84dc4b849d417ad2c2a302f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF83 14424 bytes
font_02_sfnt_off0000e3ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 16792 bytes

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