Malicious PDF — malware analysis report

Static analysis result for SHA-256 8624232d957978a3…

MALICIOUS

PDF

346.3 KB Created: 2021-07-12 17:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf79cd173985f19e4fe401cfe851db8d SHA-1: 160eb5898b7313047a6b16d1910225633e02d2e0 SHA-256: 8624232d957978a3aecb789b2606c468367030eaa4416bfaaddc490a2f233288
226 Risk Score

Malware Insights

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

This PDF document employs social engineering tactics by masquerading as exam questions and answers to trick users into downloading further malicious content. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates a critical attempt to solicit sensitive information such as private keys or passwords, which is a common phishing technique. The presence of multiple links to compromised WordPress upload directories suggests a distribution infrastructure designed to host and serve malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9778

Heuristics 7

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/459d645de6dbf9366a4dc731122cd242/similekavoluxadime.pdf
    • http://dzbnf.com/upload/file///labumivopuxefutusodelevun.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/cb6bcd4963e43a41c4201f0edceceab2/tonapetoduvax.pdf
    • http://shuswapladystriders.ca/userfiles/file/72232119327.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/ffdb954b2d2552f390fead089be36f72/dozuxujarijerirefem.pdf
    • http://industrialdevices.in/uploads/68960988339.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607752d985478---xekutipawizuxowen.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/e5fa39719d8b92f2ee410f1d52e0dfed/83487653415.pdf
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46036121884.pdf
    • http://ahcxdq.com/uploads/file/01014848336.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/difumusive.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/31b2a5230b057094245c867b37626c9c/45667710212.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b27348105ec---megulusigagikusojexetasu.pdf
    • http://industra.sk/userfiles/file/xuzoj.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/7kd8gpl70jeu637h85q73pbom2/44795107121.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad1c4c54be---84810670656.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/7d47cb7aa6e6e32c829938f4fd9c9077/pogatatupokiro.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd24b24b56---witonepinejaxi.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/db53ah0q4jlo243qhtbjgpqh0d/jefusazewuv.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/717e280ac50db16a9a9b2ce910f48a78/wikufegakowenukakulusetud.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/0a2bc20be53e63cad60f0c8419c2bbbc/4030817964.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/qb8c8jbmehkii1go2q6khdbmgf/jexefemaluxexawuli.pdf
    • http://splogservice.ru/content/file/65139086845.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/89da62a0b60b084b1332643ed7f21d1d/zefomofefagitewozasemike.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=oca+exam+questions+and+answers+pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739428a5caa---66501633815.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://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_off0004f53c.bin
8b86745a035e1cc8ebf18e855140aab1d47295a51b055d18b19fc53046861e56
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F53C 18876 bytes
font_01_sfnt_off000527aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x527AA 16792 bytes
font_02_sfnt_off00053fc1.bin
cf1df75973586ae86b5fa61e72b6653ca0a426bb8be15701a7351df466655a73
pdf-font-stream PDF embedded font (sfnt) at offset 0x53FC1 11196 bytes