Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8f4c3e0fa2e728…

MALICIOUS

PDF

119.7 KB Created: 2021-06-28 03:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a2a702d8b960da96567702ae06372209 SHA-1: 0fff1f63546340ea06d0bbb63bfe1207497c8320 SHA-256: 9d8f4c3e0fa2e7284834a9bbd2dbfa003d6fa060e62f88a1662988d5273fca0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded URLs align with common tactics for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=nationality+and+statelessness+under+international+law PDF link annotation
    • http://meteosputnik.ru/userfiles/file/rezewotaguravunigukivakas.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e583b741a5---28553092704.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d39d9cfae---kidezifalik.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/24442187644.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/100aiegvgllkp6p0k5k5hpb1j5/27587504453.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d066904218b---52013068407.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/76356881851.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/6ec7284ad639d91f6cf720226723c6ab/85620162607.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/majonufogunepavak.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083561db42c4---talafavupatoz.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/jomip.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce10d0e8d4b---mazodawevekepabox.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7fefb49d3b9240f8024e1b71db3381f1/24668572438.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609da6e6c3c36---noxomufodo.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/938e2c617360f17b78d5292c5c81d67b/xumazozulaxivunigix.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a4011e7d5e527574ebe3d2b918972e58/99127102842.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/8f465fbed08def367c7569316b1bcd54/13442144296.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/t5llh7pd0ks40l1ils4pej0a11/lelovudupemaxijasefoz.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/mbaece6k1016apvvn3fkf2msf7/11556163140.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/0bcaecf99004c97a7e700401ae24a260/65286563230.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/12/file/20210512_224116_149.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/gugamitu.pdfIn PDF document text
    • https://bit.ly/3b5YciOIn 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_off00017126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17126 10520 bytes
SHA-256: cefbadfb149cb054047f58136045dcbfa0e67c7ff3f960e2f8d8887ce5968690
font_01_sfnt_off0001894e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1894E 18072 bytes
SHA-256: 691e68719aa1e0e0650b0606c386796f625f3272444808e3b5603d53f4dafdec
font_02_sfnt_off0001b894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B894 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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