Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b831a3174beda05…

MALICIOUS

PDF

103.4 KB Created: 2021-07-07 14:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c9478b48000aea4fd6c924dd47694f8f SHA-1: 6adaf6abf272a7603f165d7c979956b421c62a98 SHA-256: 1b831a3174beda0518b15b13e7b7249a6ca89389547a953f2a6edb0f8cc90d53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://smidgel.ru/uplcv?utm_term=acceleration+problems+2.2+answer+key PDF link annotation
    • https://publicbridge.pl/userfiles/file/42050513503.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/tstmd1im2vgiqhr1o4jbcdrrtn/69885751986.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/vivep26q1513bkfdvk86kulj14/65547446143.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/81722963187.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b94e34b0b17---putamegivanasesowagara.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fbad3c24b---jekiwegubirete.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/92cc0a0d1fea35cf47ca894223dfea62/63757171267.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/380e05421baec2b617ac4db539142654/mozorogefesenatofufexuruk.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/40410378294.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/2182484262.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcb11603a3---zolepewiwodeka.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/pshpohd7846m3u6m2d74l5iuf0/lafig.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160744a6175282---napotuluf.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/d064715fe731bd070787074b26cc16e0/fugoduneju.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb9c82a36e---54539754734.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/66144860b5e3f6da47d311ad818845d7/susarep.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/9567a0b794643b25860f891d33d05015/pinadojaxub.pdfIn PDF document text
    • http://egyiksem.hu/uploads/file/jisuzimafanufevalukaniron.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/dkbqggbmf12ofm9d4h2ej4ueh4/didozelum.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609830e28889a---3371393659.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/71394422910.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4dc519448b8a2558ea4635a2dbbce884/96620647728.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb60909b6ed---zijuditovedisigevatufuted.pdfIn PDF document text
    • http://growourworld.com/clients/83159/File/gizimuvirewaledoxidutadij.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12848 20124 bytes
SHA-256: b61477203a6fd4d60235030338775bd29abfc1cbea642a4b5e75449b6df656e3
font_01_sfnt_off00015e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E3E 11132 bytes
SHA-256: ad81a2d8ff0d1624b098a876de05b0ca5a9bbab9a2e5c8273b33c7a2f2f1fcb2
font_02_sfnt_off00017822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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