Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77876f42a42bdb4…

MALICIOUS

PDF

86.1 KB Created: 2021-09-09 00:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20da1e9e339a6a1c7cfb721fd1f0f4bd SHA-1: a50c252becad9f0abe54eee7536ebbd981fce049 SHA-256: d77876f42a42bdb4db71eaf3f65930a1637e0efccac2ceda486ce4b085ca48a5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The primary attack pattern involves luring users through a malicious attachment to access these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612efcc78cff3---danixote.pdf
    • http://goldmustang.com/files/files/98131764170.pdf
    • http://duocthientam.com/uploads/ckfinder/files/14667898877.pdf
    • http://minhledtran.com/luutru/files/jixijowinuledubojatif.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/2035a7ae103f0282c6d6ad1a1561f975/mudozozibaxozofuxado.pdf
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/7724657846.pdf
    • http://baloneacessorios.com/_upload/file///sabikozezazarevenulo.pdf
    • http://onlinetradeshow.ir/uploads/files/kikobukovefilatudegew.pdf
    • http://trumoi-khutrung.com/upload/files/sofuwuwebisinefupirarus.pdf
    • https://nexapos.com/upload/files/49778409096.pdf
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/30397950757.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613613245953b---tanopogufuwivepomag.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613577cb7ea49---53208014486.pdf
    • http://khlongtoei-nfe.com/library/userfiles/file/mojopelaxedapewiwerezakuf.pdf
    • http://orderkiwicafe.com/uploads/files/29047194770.pdf
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/lukubifinelolelazaxukum.pdf
    • https://palezieux.com/ckfinder/userfiles/files/pexoguxofiwavu.pdf
    • http://guides2alpes.org/uploads/file/50476018205.pdf
    • http://duef.ru/public/file/61385802772.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/0060c6ff998f6652c6b474310aaa74dc/tumezazakogebapujubigamu.pdf
    • http://ryanoomen.nl/uploadimages/files/sitidulunagasopa.pdf
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/difowejonedomirun.pdf
    • http://compsult.net/userfiles/file/16855966058.pdf
    • https://cincia.ro/ckfinder/userfiles/files/pesunutowi.pdf
    • https://agronlogistics.com/userfiles/files/vagepabu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=six+of+crows+pdf+2
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f5.bin
0c725b55d5cb5011bf40db6e6a2cb4c5f4201fb67803e6cf71da17a542518483
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 19984 bytes
font_01_sfnt_off00011aa3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA3 16792 bytes
font_02_sfnt_off000132ba.bin
9044a7a728f945626ffba4a55c8d270e2a7d8feffac56e2077294c726c9007ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x132BA 10456 bytes