Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88ba92fbbe7110e…

MALICIOUS

PDF

68.3 KB Created: 2021-09-13 03:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66ed9e3e9371f5a2dc78aae3feefb108 SHA-1: bdb61272c9dffa1d8fc50d1852c6e14b23b94957 SHA-256: f88ba92fbbe7110e7b5a0157a04d7fd78371d76ae45506e95a9ec02c630c1af8
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used to distribute further malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5224

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=wombo+ai+download PDF link annotation
    • https://airshow-bg.com/file/tamesujonuxed.pdfIn PDF document text
    • http://newworldss.com/uploads/file/32023431134.pdfIn PDF document text
    • https://foulardfotografando.it/file/goxalegadopajin.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bfoa7gr5pct0miot6p39rus84h/zuvonefumivofanexuna.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/jevifixirudifipofobum.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/27251520241.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e75768ccf0---tuzafebulegoxavujok.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/84853728739.pdfIn PDF document text
    • http://partnercable.com/files/demonumadaniguwipo.pdfIn PDF document text
    • https://businesslife.com/content/file/28133193654.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/57269623440.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/43133126906.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/wavuko.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/88rcasgq4e31fl33l07rttgoo0/xigezubafisi.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/vakoni.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/goluxiratanuvelanome.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/66424913370.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613361c138353---busuxotilen.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/33330145608.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091202101890881.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/225592767.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/nuboxasamolovisif.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/99297792684.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/wuxopenepegivaxekaj.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/64036743869.pdfIn PDF document text
    • https://onecre.com/images/content/files/69528594678.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a15cf0f48---fefesevaxik.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 17692 bytes
SHA-256: ef4702eedc097c7795efbbe61fe048a8842821394ecb43014b899bd9f7566494

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