Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2138d9fbdc4ee2…

MALICIOUS

PDF

53.5 KB Created: 2021-09-04 04:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82ddd05f388d8d06b365e2920aea2f11 SHA-1: 1cf35fe3d1ff6bd990b24d55c7a009ac83961dd7 SHA-256: 5b2138d9fbdc4ee2c754ffef1448c0d1dfbd0c7a4fec9d0b22efd7835a6cbc00
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8460

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/2fa1eb4ba9100ee0960add6972dc97de/rabilewilaned.pdf
    • http://hurtmar.pl/Upload/file/zazifusunabipe.pdf
    • http://agro-vostok.ru/userfiles/file/42611545542.pdf
    • http://maezawa-jidousha.com/js/upload/files/84979928100.pdf
    • http://gold-carsales.com/js/upload/files/vodigezaxe.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160edf4d1430b8---pitidif.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce68545b4a---48106323666.pdf
    • http://nappsa.org/userfiles/file/26898084246.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e97e11be52153d01927d050742ec4c09/45583307984.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/vmkgkn7ci32nvqpa2hlcokg5o5/sinojetibelezeku.pdf
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/sunosagulovinem.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/32620143577.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ebeeefa7f---lemawoseranokularusi.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a4a936612d3fdd9d61c73879dd904976/7765594718.pdf
    • https://morabia.fi/images/file/wipoguvaxufipomegixiju.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/95483dec5d3230cd0f04c5ff8f71ac81/zibitimidofab.pdf
    • http://paliukenas.lt/i/File/taxaketiwevirelupefekoz.pdf
    • http://yuhao-tech.com/userfiles/file/fazabefavefesajesib.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/zebagamopakutu.pdf
    • http://picart-personal.pl/fckupload/upload/file/84620890045.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e098222f5c1---13814177617.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608604ba3eb47---16462877023.pdf
    • http://dezis.ru/uploads/files/garewepige.pdf
    • http://biolabsrl.org/userfiles/files/96336239345.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=manual+usuario+kia+rio+2016
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b91c.bin
d99e72a126edba50ed934e8b0488d2006df2fd32c570bf57b460bef95ac46b25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB91C 10520 bytes

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