Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf912713ca4c3fe…

MALICIOUS

PDF

80.3 KB Created: 2021-09-23 20:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 708bb085542855c6bacad7c5caa3ce79 SHA-1: 6861529e3afcc615dd301b4b7c9bc27f7aaadad6 SHA-256: 3bf912713ca4c3fe5d77d588b5f1e40d7eed966597d95b1538b17bd1307e6939
154 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites or disposable hosting. The URLs suggest a lure related to game downloads, likely to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6051

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://crewmak.ru/uplcv?utm_term=command+and+conquer+red+alert+2+apk+download PDF link annotation
    • http://rrarental.org/upload/file/nogavanesukazofog.pdfIn PDF document text
    • http://seasplendorpetro.com/userfiles/sixamusoxerurifo.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/busikawebabotidapidakil.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613da6f3f16f5---96017721645.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/94133278275.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/zefezudulinuvinadevivuto.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/67089841044.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/67839230037.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/76682286341.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/6543852653.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/figalimapekajemimegeri.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613dac7277b03---12276918332.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92352853338.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/83532782657.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/pugugewewutisafaxizafos.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/natuposev.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/3347313363.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b6c6cf769---bugepovafolenawubozo.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd56b2d42b---vilarulatominotolovilo.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/kirufepamidaxasigoroju.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-20/20210920063434378020.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/segasidof.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210923230224.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/zebimuduxiwemate.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_off0000f3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 23652 bytes
SHA-256: daba274be66f9dc01ffc8c4ffd1ec12693eb6f119c858cebf5619c4c1822fe4b

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