Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf1410eaa99585e…

MALICIOUS

PDF

88.2 KB Created: 2021-06-09 10:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: dc402945a81d82a64cddf23f5ed0933d SHA-1: 050e146b97206b3a2ab967e8d0ba4178629c8000 SHA-256: 5cf1410eaa99585e942135ffc7558500a94aebd6b624998473cef544ee3875aa
156 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many hosted on compromised WordPress sites using the Formcraft plugin, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to birthday images and wkhtmltopdf, which may be a lure to disguise the malicious intent of downloading further payloads from the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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 https://chcial.ru/uplcv?utm_term=happy+birthday+shifa+cake+images PDF link annotation
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6d28c941---naraxirosojogu.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c141ef433---bagunus.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e40549906c---jitalokoxolamozatuvolo.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2b832723f---85614893523.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile/%5C/2021050407001692.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/47992102987.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4cb4562b6---xokovaxig.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/aa06dd2804a042a3f7d005f6759fdd83/laratoluzogasurikonatijeb.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/9ea383faa2123974deb75a92e97a450d/feruruzotijo.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160748d56620ab---sawitatizabufesedazukalu.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/f3467848533206d84137ca6ac01175d8/segobidejugogafevemeje.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/kl6gm2evhl4744ejofgef1u3cd/niginirijivumujimiri.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/67978611781.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/pnrk85vp1fgpksja8lfth1tm00/85868445824.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/840fea482df6d4721f0702b065ab69b5/63923284994.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/wipomitutenop.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c6e38243344d01ec94e093706fee2636/dobuvibadam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 5144 bytes
SHA-256: adcaaef5b9f2aacf93fa339b50f14f382493445677aca7fcca17a515e2f427c9
font_01_sfnt_off00010341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 5804 bytes
SHA-256: a1da0d436fe1b9d5368ca0bc49bd64ccaf4f937980d7f35d3c8fa6d5715f5f5a
font_02_sfnt_off000116dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DD 12236 bytes
SHA-256: d3fe44346cfdc7c573d4165dee178350ea285cbfc6a1fd7c718855423b6718a0
font_03_sfnt_off00013e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3C 16376 bytes
SHA-256: 8f006c5849478104794d0d2cfba3a6c1ccec86ad99cc9cf23d101d11a56a65fd

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