Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d5c2720c2c748b…

MALICIOUS

PDF

79.8 KB Created: 2021-09-08 09:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecba0a373230b372accfdc1c39c0a3e4 SHA-1: 4840776737566c0579a285192e13152a7986b382 SHA-256: 28d5c2720c2c748b811b6625bb379188bad4146e0e47f8b3db8b8195033f80ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://ecohort.com/userfiles/files/vavomigogizunuduki.pdf
    • http://watthaistuttgart.de/userfiles/file/pexaloxulosi.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/zikexaxukike.pdf
    • http://leakefamilyreunion.com/clients/63964/File/71456110589.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/ab0d42b28bea81c0a06bb26a1a887fcf/bivizezodedomowe.pdf
    • http://charivne.info/images/file/36805264991.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/37abf349718b53944cbe0edbef6282db/remepos.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/25da20facb9987751c7c17377db15937/52570802626.pdf
    • https://kalashad.com/userfiles/file/jojefelizajafoza.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/2a15791e7fa10badfee09efc1aa06f53/89476166510.pdf
    • https://delaneyllc.com/ckfinder/userfiles/files/34595493634.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/bafenonimezasizem.pdf
    • http://aeronautike.com/userfiles/file/zefilurixuve.pdf
    • https://oklogistic.lv/upload/file/miberowavagulafuge.pdf
    • http://healthywithhart.com/res/file/74324656647.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/gadiposamibevimapawe.pdf
    • http://d-a-s.cn/userfiles/file/4289535871.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612432d746cb8---sudujizetezugalilopokebax.pdf
    • http://bwc.lt/i/dasokalakuxewi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=elaine+pagels+the+gnostic+paul+pdf
    • 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_off0000d337.bin
d827ed835c4e7af53863a6c605aa8f40d15a946c5cacef5ed218a5ed5f3a3186		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD337 17816 bytes
font_01_sfnt_off00010129.bin
4e125632af69568087f014999901e59d60e2888972fcf3869ef9ebcb66aaecc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10129 10884 bytes
font_02_sfnt_off00011a03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A03 16792 bytes

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