Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e1b43e476831b63…

MALICIOUS

PDF

89.6 KB Created: 2021-07-24 14:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 37c931d3e2bc9969443b94c5c4f5c464 SHA-1: 861b7742b97387db65db4e64bac5b4e8b3f0e218 SHA-256: 9e1b43e476831b635a957ad6991a958a5a85720d4c7701fb85b1df3dcef27294
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d47119fe1---dawulelutokojugiregawoses.pdf In PDF document text
    • https://securityguardsupply.org/php/uploads/file/tepewelubolatikirakewune.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc6423290d4---wolobepakozidol.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/ft5vpj8n4ajfl5nc61kot4t1ko/muputinimulobulel.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/24advh4sk2ulipbqo6tmlar3b6/nenewenewofuvumopu.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/5c927cc90a85ba92a680093f9296b555/seralaluxu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16080c8e8cf50a---12715292796.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160823be15ad55---49281776680.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608888fb2d9f4---27430798311.pdfIn PDF document text
    • https://actor-conseil.com/files/file/3669349407.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/posk47rrvarb8podcott32tli0/fujelo.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/vurupuwifomeni.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf0f3b454b---setigowemiwosupabajatinus.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/898b96c22cf39129f848682cdc41a0e5/fipofa.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/mifegujenoz.pdfIn PDF document text
    • https://landi-bg.com/images/file/dufigijogubizigo.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb2752fbbb---wabujadan.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/jepaxawanixepokewopot.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c932033d243---98271857205.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23304d25c3---lirowozuv.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/72130532643.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/33c4f5463da538dfa56306b034d0ecdc/pedotozerexizozerilijine.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a80f9a0bb52---54659600567.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/dcc6ff2dbab5e51a91d3d47ddf987993/70882614098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=exercices+mesures+de+longueurs+cm2+%C3%A0+imprimerPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4F 18764 bytes
SHA-256: 14f060bccfb3b40f339745caf19b7703419434494a759f3d08be0bd3fca6bea4
font_01_sfnt_off00010cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001250a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250A 11084 bytes
SHA-256: 194613d7bb491f045e567eb2d3919cda09317e7cf88403109b8e5dfc093de324
font_03_sfnt_off00013eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB2 16684 bytes
SHA-256: 0b66887e43cc35630d0970669c797ecfbf492bb097841a83f6681a0f5b87338d