Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d35f423c11c138b…

MALICIOUS

PDF

163.1 KB Created: 2021-07-05 11:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 166886857460e7f1a7c5ae0b94fdc81a SHA-1: 3a13d10a6fa937cb35b8689fa7ef9e199a60c157 SHA-256: 4d35f423c11c138b72acd7f90b6566b52fdd9998396c687524de2720cd479912
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings and URLs point to a pattern of hosting malicious content on compromised or disposable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://paymentor.nl/uploads//file/sevete.pdf In PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/62185273302.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5012_20210517181541.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/lumejeta.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f63c803712---judeza.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082f6983e85d---59439815513.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/rujafaso.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/846737a881dea2b82b5bf9ab964aea66/20388563085.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/54v6mng619hj1v41ddmpsatjv6/luvotovujusodininavaralo.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/79948219387.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0fd4bd5f7---sigebajapibizezubigo.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qbejtc3538le7impria4oh4f45/voxinakaweti.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608625ea046ec---mowimuwujeba.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/51293062617.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/7ffc5ffed321e8f4bc410e4b48709dc5/sidomitapenojiruda.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/53484957020.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/2a12ecc28ac079aa5ae728ac39c77c13/40841244404.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/wujunusixefor.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818794bde9e---xomobazuvazogibogudi.pdfIn PDF document text
    • http://sport-way.ru/img/file/zixupejizuguzovufebipajig.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608784d7503e2---8389854030.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/jojekaputukolireviku.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/pizoxudezitudupevimel.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/bakirasefesofatetodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+homilies+of+saint+gregory+palamasPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F918 10884 bytes
SHA-256: b520b359b652528103bbf750b38592a49eb7ac4f1910c7ae851cd430a7c9b6da
font_01_sfnt_off0002121b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2121B 19940 bytes
SHA-256: 89ffd324af7ba4dadaeb59d5aa9881e173eecf4134b35098b26264bc33a31d7d
font_02_sfnt_off00024392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24392 19248 bytes
SHA-256: b647185446c2a3bd43918cd5be159918b601e85caeba91657c67a0d1e48806a5
font_03_sfnt_off0002642c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2642C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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