Malicious PDF — malware analysis report

Static analysis result for SHA-256 be482cbf8da0a7a8…

MALICIOUS

PDF

73.6 KB Created: 2021-09-04 03:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3ee2c28b0f73955be2fe9a9895d0fd2 SHA-1: 1ea43f3b85f45dcb55337d0cbccf39e75ac1af08 SHA-256: be482cbf8da0a7a802ef1d8d94a3bd9df4eea590c742b20314f24f1ffcc2dc18
156 Risk Score

Malware Insights

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

The PDF contains a high number of external URIs and link farms hosted on compromised or disposable domains, strongly suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection further support its malicious nature. The embedded URLs and link farm structure indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://debeleven.net/UserFiles/File/28798695450.pdf
    • http://thinhhoanggia.vn/Images_upload/files/nesoduxi.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/nqdt7nq97aj6piri9uikr2fe34/sebasufibozafinonidiruja.pdf
    • https://btcauction.vn/hinhanh/file/kalipixanonedilisez.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a78a9b3118c---34054229218.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63de0ac66e4f98fb32eb1dbaf6eb5c17/rewideneku.pdf
    • http://ebslang.net/_UploadFile/Images/file/31972901580.pdf
    • http://appli-veolia.net/ckfinder/userfiles/files/16569338060.pdf
    • https://akproauto.net/nbloom/fckuploads/file/vudusuko.pdf
    • http://askort.pl/Upload/file/gimesijafup.pdf
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/kipovikipadejux.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/i4adh8q0o4be3eoe7uolca3kkd/46383390430.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/43ba43ede3c80b1510090ba54973c4f2/19037984594.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/qc9q0g9e47lkjnrs7o138cv6ev/jojimelepetabali.pdf
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/9831732428.pdf
    • http://airconbank.com/upload/fckeditor/file/mesonufarojijofepela.pdf
    • https://houstoncoinshow.org/FCKeditor/file/81527550973.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/25691543242.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//melefofidiwujuvanitak.pdf
    • http://tutaylamhet.com/storage/ckfinder/files/zaradini.pdf
    • https://mongolia-volkslift.com/uploads/files/54828107561.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/f92a6daedabed191131a68f62be6ea9f/73453885727.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/82bcb0e4fb78d70e066f4e52643e8fce/divelosozegipu.pdf
    • http://tubietelbar.hu/uploadfile/58552632604.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c6b861d59c3f17ee2c4950f2746e6f7b/62731575752.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cadaba+farinosa+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_off0000bef8.bin
b3a738b6cf7ee28a84cffe71c55c266a866deaae8cf2e44ee6dac9be247be00c
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF8 10384 bytes
font_01_sfnt_off0000d63a.bin
bba4ab0a9246a7184262785c7ed87aa8c847205fb813eaf8fc019a616ea48dff
pdf-font-stream PDF embedded font (sfnt) at offset 0xD63A 16592 bytes
font_02_sfnt_off0001011f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 16792 bytes