Malicious PDF — malware analysis report

Static analysis result for SHA-256 425ef973b50df332…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 17:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47d1d7017b93c2b6b6f8510870509812 SHA-1: f873b0e851bcfa028590f4ca43b1345c249dc5e0 SHA-256: 425ef973b50df3328911b2301c0474f7a507d5b223eeb13de46943684430bd54
204 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution lure. The presence of a security bypass instruction further supports a malicious intent to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bobiniauto.com/userfiles/file/pixubidu.pdf
    • http://retailpark.bg/uploads/wysiwyg/files/10123181874.pdf
    • https://faktxeber.ru/resimler/files/38862235470.pdf
    • http://capital96.com/userfiles/file/58321911981.pdf
    • http://duythuc-bearing.vn/uploads/userfiles/file/tegazilazibujarinitoxidu.pdf
    • http://strap.sk/uploads/file/18361483923.pdf
    • http://ziconiavip.com/uploadfck/file/jeketeso.pdf
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/41958498130.pdf
    • http://st03.it/userfiles/files/walutovakakilumekifufare.pdf
    • https://securitydm.eu/slicice/file/19053266934.pdf
    • https://renhedc.com/uploads/files/202109152104023401.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/fbc0fa945aebe547c8a1e7a31322b47d/xiwulikexoxukakulirekatam.pdf
    • https://kalimati.in/userfiles/file/vidafor.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/46hmgrdl3e4p48b71gsv8rd8em/rakebojufudixof.pdf
    • http://thietbiotoviet.com/Images_upload/files/26501664446.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af8c4a356c---buwedesejagalokoto.pdf
    • http://sistersaviopublicschool.com/userfiles/file/vugoketuta.pdf
    • http://brukikostka.pl/uploads/page/file/japezokulegenamuno.pdf
    • http://birkhoffhi.com/userfiles/files/gapefuzizosivexabapan.pdf
    • http://sparan-art.ru/ckfinder/userfiles/files/1456637679.pdf
    • http://sugarfree-gelato.com/upload/file/vipok.pdf
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/tiwogosinenisolo.pdf
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/zemabiwasedakib.pdf
    • https://fasaac.org/temp/files/32986709338.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16144e067e4290---34605542467.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/25bd6b79bac12466f96a756a998725c7/9394163070.pdf
    • http://prosquash.by/data/22765822158.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fly+hack+in+roblox
    • 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_off0000d639.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD639 16792 bytes
font_01_sfnt_off0000ee50.bin
59c38a621a35d371828c51164e7d3909a558615402a48bbbaf54eeb6ca750a04
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 10352 bytes
font_02_sfnt_off0001058f.bin
52cdd5bc3b71487fd94ef2a046c7d833cd7975f087a7bcc87bd96e6c95baafab
pdf-font-stream PDF embedded font (sfnt) at offset 0x1058F 17832 bytes