Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57b273be735531d…

MALICIOUS

PDF

72.8 KB Created: 2021-09-03 16:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08260248551b92c7d80983621f8de656 SHA-1: a079c6e315f98fef4bea7549b30e6ec25e18fa4f SHA-256: a57b273be735531d7bdd43ae261c332bb235fc312794c7fdb859cb94ca1272d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b03e574c1ef55eeaf5ad5babe23676b8/42526693657.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/nivoxilefotejagetol.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075c25f9f101---kawijazezubufatazaxep.pdf
    • http://profitoolinfo.ru/ckfinder/userfiles/files/98699600285.pdf
    • https://zlatartopalovic.rs//files/62518505047.pdf
    • https://hinodanang.com/uploads/image/files/wuderabumesapudajuziligor.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924ef0d619d---pezomo.pdf
    • https://ready4use.ru/uploads/files/39433020856.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/2049v52b1ul7qk78e4mpa8eqn1/befedufogag.pdf
    • https://turdv.ru/SITE/files/editor/file/bagowatibopugemud.pdf
    • https://open-call.fr/uploaded/files/14401898684.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/38c622f02444a7b75be80ea1b4d1d217/41133729143.pdf
    • http://leebyunghun.org/new/upload/board/files/76417441793.pdf
    • http://happyhanool.com/ckupload/files/pibokufewogonezanu.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/774644caa709d43eb39f4dfb32542260/17221287926.pdf
    • http://schodylux.pl/userfiles/file/76553796544.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/59fcdc1006a2eb86653184b628795539/91350619636.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd8e748f05---giwod.pdf
    • https://rocksoliddesigns.biz/userfiles/file/84801907070.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093064858622---nosobi.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608566c787731---fazevijetugetezuritepoxok.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=oxford+practice+grammar+advanced+george+yule+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b759.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB759 16792 bytes
font_01_sfnt_off0000cf6b.bin
6af261124fb6dc06def5c84d44a139558f05e382483547eb2245e408b43a282a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6B 16712 bytes
font_02_sfnt_off0000fad0.bin
67fe9fc897a2e0417d0001f0515658fc5ff18eb07c3de0c6704e6e6d24e8f84e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 11288 bytes