Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c3148ed718165e…

MALICIOUS

PDF

97.3 KB Created: 2021-07-25 12:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fed25315779c564ffa63746a2cc1cfe0 SHA-1: e19de1e945659a8eae10f7eaa49b17a95a96c884 SHA-256: 50c3148ed718165eb6746b9808e365536ce1c7e28858ba8e3017ab5153ddf57e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting it is used for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and link farms indicates a likely intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eeb60e205---nezifugamifesax.pdf In PDF document text
    • http://maisondequartierdespareuses.com/userfiles/file/kazuzezu.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/78171507555.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/pagarugevinuwuke.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/a425a54d4b09196ff24501ad0afa6c47/totowefoxigerawitulugawa.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/c6d75d540d0acb61c9cf63f8b0e8b92a/xurotomidi.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/70440070386.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/97874596390.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/lokolafukuweniti.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/13157580351.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/jawijutujevonilepotanevi.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/21467808307.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160bbc167669ca---muxejo.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/9942143576.pdfIn PDF document text
    • http://vhktn.at/images/content/files/56135932309.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/aga3risje4hukpfus906k4vnt7/50756623670.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0cfe012ed---38645590832.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/61495321421.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/xidotefigeladisaxuneg.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/oprmvt3oh2oj8jpm02i0bmmut6/67439096414.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/26885045059.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/9045022861.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/317e19c6705804ccc0237a37d213e07b/tukurobejasemirazewu.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/584s0rmujnvac9en8on9957np7/dedozokuwunopegete.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081405dc3a86---tupijijolimotukibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+are+classed+as+self+employed+expensesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11408 18032 bytes
SHA-256: 4c47fdcea6a1ac679d52f3ab631a5a3b05137b9ce7aba0e15ef355784f432279
font_01_sfnt_off0001436a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1436A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B81 11000 bytes
SHA-256: 680de12645e0442339f54e169f521452ebc8e5498c2b5952db84ebd13f9d9deb

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