Malicious PDF — malware analysis report

Static analysis result for SHA-256 3881f015aea16040…

MALICIOUS

PDF

90.5 KB Created: 2021-06-13 15:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 72b5024bebe2d2b51bfa07d37b9ab829 SHA-1: 54c55d20dabd48f4602e4965b2426eb02d95180b SHA-256: 3881f015aea16040c715ea851f9fd2a00e364d53218bcfa3b095d691fb7f6fe2
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The document body, though heavily obfuscated, appears to be a lure related to sheet music, likely to trick users into visiting the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://crewmak.ru/uplcv?utm_term=patrik+pietschmann+he%2527s+a+pirate+sheet+music PDF link annotation
    • http://hanhthien.net/uploads/file/pagonapupumosevo.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16073b80f820bb---48105549273.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffcfc97507---kufetodixusel.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0736a4c00205389c1c9a629fb5415b26/30107365048.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d0a124e78---lejunawixedofiwenozunes.pdfIn PDF document text
    • http://waterreducer.cn/d/files/bufisadofiteromepawo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ab6824611a613ee5dd1d09afaa0b1226/35281464360.pdfIn PDF document text
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/de4f6ef013f49a8aa0cdfa76ffe181f1/zazunakogofore.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/ntee318tum16p1me4ifs91g294/pitudosivapuzezofemafibu.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/turopude.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/3fv2om8i0g46d9m842hji4qn62/5439908473.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/94051337978.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/99dd2a1a4ae2a3dec67cca5a6dcb94d2/56917894437.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/23c7f12832fa51dcd145a13bed6be339/jofowodurigajaviri.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607f852d63bdd---mugiguxewadivom.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8116092f3---46374449209.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab30fc526a---gagefoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn 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://www.gnu.org/licenses/gpl.htmlIn 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_off0000f5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 5240 bytes
SHA-256: 3518b6b6914b8bbfaef1c30b1efca65dacbe2ae4e00368a1092a1c935ef46798
font_01_sfnt_off0001074f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 7408 bytes
SHA-256: d34d17c634e8395892724881039b265469dc2740fb6451137f9db472b3a2e9cb
font_02_sfnt_off00011b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B78 11780 bytes
SHA-256: d776fb7dfc2f8d817086c0d5b77921d4ea232294e16fdc5389d0bac48f4022c1
font_03_sfnt_off00014352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14352 17120 bytes
SHA-256: fc55abd1cc4b1de60512191a91b96eb9a5574ffe9c58f10698b6ba2e4ef87ac5

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