Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e6a3d1a936cd645…

MALICIOUS

PDF

98.5 KB Created: 2021-09-04 17:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0be925e21624a79217bdffff460dad3f SHA-1: 81f6a48af2bef0e198fe5286a1b136578e5013af SHA-256: 5e6a3d1a936cd6458fcc5264f267bf4939ea218b8b48a85caab9874aedacd5d8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://catamma.ru/uplcv?utm_term=fender+passport+event+pa+system+manual PDF link annotation
    • https://akconta.com/uploads/files/85131236607.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/xirobiposolajonedikawafaz.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/14933968535.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c986d7fbc9---11422023394.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/zodalijejunenof.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/b608f64da907b89390399b661e4ad45b/dasakap.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d898636b9---revuwukutabe.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a277041d4---pukemivozalum.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/iucaqophthakma40us3qmru5ve/nefagabixotud.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/giwibufesisobagikisunem.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/puvodufamatebexawakobivig.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ehqktm1u72u2vmflna5ojc0449/pibeseduwuforofedodo.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/afc4f38badcfec294a02cc7ef893b9db/bidubodovojakejegu.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/84883068057.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/24992259930.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/6a1a0d04d16f98f10e4ecebffca7bbeb/64375508704.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/kcapc0m5rfi8umi8baqk7mcub2/fasogepojuxepodot.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/83851065220.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/upqssr9ujavebqvi4r5g4k1kqe/kubisanazelubebete.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/28e84982a99ddfc97c435c75f5a01a0a/pukinepofekelunexoraw.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/61514540895.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4dabaa9ee---sozodiz.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e606b0e3492416501861637c05eeb762/potuxaxixikolatel.pdfIn PDF document text
    • http://makaroma.fr/upload/file/67833153405.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_off00011383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11383 21456 bytes
SHA-256: f1a6e94be946ba4f942f80ae5375e244cd7d5004cf5afe5ffb1fe8765322cc3d
font_01_sfnt_off00014bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16414 10716 bytes
SHA-256: a6329d005841e7b47c6e3c7b2fa5289cebc33aa0f95e1dec36c98b3b2888a3c1

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