Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c850b03a769a575…

MALICIOUS

PDF

71.9 KB Created: 2021-09-05 22:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5ef4ca8d544e3360c52272a229e495e1 SHA-1: 2a9d6bb398f9cd8a10a8600c36103d9ac1d5ce35 SHA-256: 8c850b03a769a575aad1bc6448fad353db3e548297afccad5a2a92cc5ff11986
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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 or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, indicating the PDF's primary function is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=aranyadeb+comics+in+bengali+pdf PDF link annotation
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d8e7d06dc3e4a133cbc1fe3184b455ca/45141620258.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/18501113386.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce297bca56---muwosi.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/19e932861c5ddf51da2c1ec2ad2e357b/dezoris.pdfIn PDF document text
    • http://iucecb.com/files/file/24393117780.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/kixazafav.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c247b4c651e---zujilarijagivev.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/5a62bbdb94692144a838f34ff29cf1d9/27549480631.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/cfcd844cf9c342db3ce7c8a4d6eec196/90370909356.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/61808265670.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/zipemuvefezukugazutozis.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/65798533992.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2369cd02---lesisavisuji.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f5f1af037---fatonaguberusumojiwodax.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tebebanumowat.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///nuvew.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/82985027703.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/44978261013.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af7884f145b---89894484337.pdfIn PDF document text
    • http://cssh.es/img/file/tumumumazuxiwu.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/6b79eaa0d8d3312fa4b6d5cb8e17be79/vufadenokilotadaxig.pdfIn PDF document text
    • https://chpcentre.com/files/file/tupuzo.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/30932403867.pdfIn PDF document text
    • http://dbhsreunion.com/clients/21010/File/42312764116.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/96511e3c8e450ba28c5e7d01a2d4c473/zebodukitolorodewaxeme.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_off0000b4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DA 16968 bytes
SHA-256: ab1483f2e4da43bcf325a27da5e49418caeb35070248f14f4d6e0778fc73c7c9
font_01_sfnt_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 11100 bytes
SHA-256: b1949d276a04df10274900e5dc3707666982f8b9e2c05b05a767f883ef526c2e
font_02_sfnt_off0000fa0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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