Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fdd729b8a768b3d…

MALICIOUS

PDF

85.8 KB Created: 2021-06-29 18:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d00d632f2f6b48de7d6f28de2e4ec47 SHA-1: afcee0731c773c697d4a5532441c6c91409929ac SHA-256: 3fdd729b8a768b3def20b124dd00039457a9c22458927608c0816b224f331af3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests it's designed to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://musthighschool.mn/ckfinder/userfiles/files/duzabomebivodolosokamuteb.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079419399446---26285074164.pdf
    • http://funperm.ru/content/file/tutavebonezepetojune.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/3116214029.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/e4bbsmsgjkven9lpdjncgtvvhc/28816204734.pdf
    • http://ngor2-3.com/file_media/file_image/file/73674835605.pdf
    • https://preciseenergygroup.com/media/82638413146.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708a6a9b5ac---dekisifigi.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/f4ee1be7874dc91dc3dd4aef1db07459/xubivupivak.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24c7193439---87615814870.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/nnj4ru5g9c2gn5rrt3jdja99he/sapesobamotuburevoxejirag.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/4lqi1k7rhe9vj0okkqlpn6mojr/sufigatutijuxojidexigap.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b245e24b69b---37361487548.pdf
    • https://autotrans911.com/thread/admin/uploads/file/94918882463.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/77q27naulr2a167q6hmem1s0sl/99744845456.pdf
    • https://panificiopasticceriabattaglia.it/file/47823045610.pdf
    • http://inglewoodreunion.com/clients/68690/File/63740093320.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a878851cda---99731029006.pdf
    • https://nadamasristorante.it/file/bifenirivikor.pdf
    • https://latework.cz/soubory/xemaribesavorokoripejudu.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160d286acec9bd---40554146590.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608985e4d307a---vixebede.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ca2a9ff6a085b900178c6fd7d79b1fcc/46757439470.pdf
    • https://makenie.com/upload/files/55493966715.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160701c12d7064---raxipafelikovutim.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=easy+to+edit+online+pdf+editor
    • 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_off0000ecb6.bin
3f04ee2171f8d06c463434c4851d424d8cd9d45c19c65accbe9683ea18b68ac9
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 10588 bytes
font_01_sfnt_off00010500.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 16792 bytes
font_02_sfnt_off00011d12.bin
b5ac0b7ccbc62df8a132f4e891cb719e27c1fc952ded465779efee72694a4590
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D12 17120 bytes