Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ace9a42e493d5c…

MALICIOUS

PDF

82.4 KB Created: 2021-08-26 15:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e5e97261a24356643246ffc33af0e8d SHA-1: 66bb3fc98d27cc186843f227e4e374e55c976196 SHA-256: 74ace9a42e493d5ce355a65058dca62d9198f3b927e3eaadf2ac74afcdc80238
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious document used as an initial attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/vqa14lu09vmas101v6a62h4cm0/mekoreguwa.pdf In PDF document text
    • http://zimmerei-possert.at/82937780798.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/5e2f0ae8819343bc58018fbd7c6dd731/wedarosojik.pdfIn PDF document text
    • http://cl-pub.com/files/files/79174726574.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/e6763a6d78995a7e31da44e3bd92b0e2/22074772548.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afac5abada4---58813886601.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0c08581a5---14082767960.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/86808510111.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/q31bu6u44gf9fgcnj2gastl1f7/venuda.pdfIn PDF document text
    • https://tmtteks.com/files/43152180897.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/xolopov.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/15353006311.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/89410408011.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/688f9884394de66d8ec52334bdb6b762/82532409352.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/81804637045.pdfIn PDF document text
    • http://xfswchem.com/upload/files/ferinovuwuzozejirige.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/cecb047d8cd2ac7921d01f6a595c0c7c/72411710277.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef41b9eeeb---70891272656.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/c2b3ab120fd9a5ec5b98bc2afa3c3bb7/mizudogaxusajirudoxejozu.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/sesisu.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/19265093251.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/100a304a865b1166f5baaafd2ae7fd03/jememiditow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=puddle+collar+pipePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6C 17848 bytes
SHA-256: b518408408499caf52751b64805f7621fe9922c3f6a82571c8fec1f83d1539f2
font_01_sfnt_off00010cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 10236 bytes
SHA-256: 6042f07bd10e940527bb901527e5e5ecda44202c1878d24fd20fdacf8180280b

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