Malicious PDF — malware analysis report

Static analysis result for SHA-256 3831394ecb745c49…

MALICIOUS

PDF

70.3 KB Created: 2021-06-13 10:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 775373c8677bcf76f6eb104b079ac108 SHA-1: 2a087576f6a73d109de36537f2b90f3bbcb212b7 SHA-256: 3831394ecb745c495a7a8a214ccd1113d66e49650545ea30039584201a110067
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. The heuristics identify it as a link farm, with numerous URLs pointing to compromised WordPress sites and other potentially malicious domains. The document body, though heavily obfuscated, contains references to 'diamond platnumz songs 2020 audio' and the authoring application 'wkhtmltopdf', suggesting a lure to attract users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7698

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=diamond+platnumz+songs+2020+audio PDF link annotation
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/82114af1a07622a0b3e14594c74c0e17/42847918888.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/betuderewoju.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/e8c0da902c074c97393e2406aa1463b6/42071730042.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efc2d1e140---2499557360.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/95503651937.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/28987655139.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d93246480e---wisozawuxoxazuto.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4b5fa5a70033cab840033d028a785708/vababejulopowejab.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ht9ialr7ec4l98bk92gvpetba6/mufisetigijodisudilujume.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/hdup3rvdm1tvk5nd6t91pt8e44/kelobilafesavorafozipusob.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e404cc54d---zanejujeze.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/gorazemalopidu.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/gejogasalabikurukeg.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/nuxokeladozogi.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa116ff3bcf---womonulotuvepusujenazunow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 5508 bytes
SHA-256: eb8fc4186583484223f30efb30632a800c12100311d7b8232a339848cf23b059
font_01_sfnt_off00010087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 6820 bytes
SHA-256: e656988103506d9906faaf9e6385e48e91d7acdf20ad26bbf1694df7515067d3

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