Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd111a494c822fb…

MALICIOUS

PDF

81.6 KB Created: 2021-06-23 09:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 17e78d513986fae3c7f14141163ab0e1 SHA-1: f6042bc57af7b211c755a97c8802a77bc92baaec SHA-256: dcd111a494c822fbb05957f796b8252098bf2cc779eb2fe3f30e9522e6cf31d2
196 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of using password-protected archives to bypass security scans, though no explicit password instructions were found in the document body.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/uplcv?utm_term=mechanics+of+materials+8th+edition PDF link annotation
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d2c4a61d02dd39996d132db0f7d4a63b/37393053938.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071c6896a88e---zegigurutimibuvuradutonap.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa69d507ed---13792487159.pdfIn PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/48749228067.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b412ac257b---volataguvedanuzokeke.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3cd1cb2d8---59348327856.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770d51ea287---jowilalenoj.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a65764a3fe8---kimawabas.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/65591f481dca6fbe33dc8773a3510ffb/57551581756.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/lhtbts8a2lb4g8b850iohsfr7o/suzevivi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e665b1f86---kofoboloduku.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/wuretivupusasagadokinare.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/74816201005.pdfIn PDF document text
    • http://sxhk365.com/uploads/file/%5C/31179295684.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/rerag.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a8e2480e010e4f8fccf950dc703a7e3c/11543507049.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000106db.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x106DB 20720 bytes
SHA-256: fe24d5444c7adb9aaaa9a1556722501138fd17ab65c006a5ddcc50f92b6abbf2
font_00_sfnt_off0000cf63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF63 5248 bytes
SHA-256: d0c76d8acd93a02479c6c967a72292b6b0c6bac09469db0cfd0d006154814bbc
font_01_sfnt_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 11228 bytes
SHA-256: 0971c343dbac6eaf33dcac1c446300b880c61f9bad4345a8ef4d937339592e77
font_03_sfnt_off00012949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12949 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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