Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5080d42bc10c8d8…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 22:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 75ccb0b2c038758142c1aa983056513e SHA-1: ecdb8e88a4d6c50b34841c89f5c4cea6be42dd3a SHA-256: d5080d42bc10c8d8ff11177b5e5c819e8e7c229f66346056bfc125ace96bc384
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crysiq.ru/uplcv?utm_term=list+of+character+defects+aa+pdf PDF link annotation
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160824352c3c3d---51412266808.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/begubatolijowozasubukuzir.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/23954924224.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/647153364.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b4be10e4eb1d9989806cfa32a4be66ba/12916389364.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/6g7i8d18r8gg0ip8udi5pi0tf1/ramuxa.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/53731317094.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/mtn4k7e6ro8q19nd4dhl1th5oj/betelojusikunana.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/26500363639.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/87432194229.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/8476fb55b19cb0cf4d8c8870e1c83541/relegoguzeluz.pdfIn PDF document text
    • http://hotstamping.pl/files/file/39892000792.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d08dd9db5---dodojobofafonamoserewi.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/zejile.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/27263584005.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/osljo3j24b6rt1gtg54v4l7pj1/70421533966.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/12753250316.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/22sg48lj18rustm3qrlucjv94c/kupobunalebaru.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5eb0e894dbb7561f47b69de008d1218e/naxikujadixaragane.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/48532425187.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608084219987f---bukovubexomorerofimof.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/taluvonexozir.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/wibabafil.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_off0000d23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23B 10524 bytes
SHA-256: 12e07cbc7e0733124d7c9dbff28a69fdb0f1064f9707e4176d2e362141136547
font_01_sfnt_off0000ea58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001026a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026A 17392 bytes
SHA-256: ee6d97fff73782ba9b02f1fb3e4fb13ce66b873ff06e08996e50020a64d8d64c

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