Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1531d392e4c2e3…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 19:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c235c4da92912b7ad6a0f32b7cbbe1a1 SHA-1: b1f1d1c52a058cc4ac1d61682f0b5215dcc702cc SHA-256: 1d1531d392e4c2e3eab8b8c43f86873085b562df306e06eee33538229b1e8e64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=coifa+de+inox+%2890cxs%29+manual PDF link annotation
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081f90832872---37986067113.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609457db6329c---lilupiniwibajarijigesed.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/64916290490.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/38765609351.pdfIn PDF document text
    • http://tipiland.net/upload/file/29356551602.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/73751366782.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/35834608242.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/37326882803.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/muvokutajuwuw.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f81806e7---xavidokatepo.pdfIn PDF document text
    • https://agatanorek.com/files/file/jefod.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rsbsf2trqr7v4vs4qi2j8bqc4u/sebowafowulonorofadebe.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/50329618971.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/82fca75a3ebb7e6e7c0e1b4a4141bba4/badakekuto.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/kiwugoxelojupud.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/58998089b0bc39cbe44ca37e9b6d036b/girino.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/5d35eeac2b2c63efd9ac9be0a91dd91b/nixowuma.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609907fa5e3a6---jesezekakakuge.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/zudexozedepemolipipala.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607695e695479---74343741182.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/0d0d8aeae6d6854411dd45b579e428af/93779298411.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/073747517dd1648d2689d6f7e4837fb1/dijarurepomiziloxowamubuj.pdfIn PDF document text
    • http://poorclarescork.ie/images/68682997670.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/scstjeus7i79thlu77uogpu3nl/pofum.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/f726f4f869e3f83a16c1aa6c536a8d08/koxujojepowixununu.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55F 19164 bytes
SHA-256: 2766806802a5e2631e09b232caaeb62763329149958dc2f8cf625961b68cc2c1
font_01_sfnt_off000107ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE1 11120 bytes
SHA-256: b3c84fa44df11e7440ffb6e9858c8c55c63993729263c80ba1276c9a79b4e92c

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