Malicious PDF — malware analysis report

Static analysis result for SHA-256 a338dcfafaefbeaa…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 16:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de02fc355a17c154eed2a329e543f077 SHA-1: 1922b979008005df3bb6563c86782fa11be20361 SHA-256: a338dcfafaefbeaa673d04740549e0eb1aa5e9789af79b07b5ea2abdb55d2625
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to domains identified as disposable or potentially compromised CMS uploads, characteristic of a link farm used to distribute phishing lures or malware. The embedded content appears to be malformed or obfuscated, preventing deeper analysis of specific malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://studioschicchi.eu/userfiles/files/68739344263.pdf
    • http://hide-bo.com/img/tmp/file/ririmalobujodi.pdf
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/96990893781.pdf
    • http://etoprosto.ru/ckfinder/userfiles/files/8562866750.pdf
    • https://monyetjoget.com/contents/files/mupuriwogik.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142d4bacd978---sidediro.pdf
    • http://studiopassarotti.it/userfiles/files/lasukajereg.pdf
    • http://lianbang123.com/uploads/files/202109182151156404.pdf
    • http://hhsmelt.com/upload/files/53311817361.pdf
    • https://marikakozmetika.hu/editor_up/juwazoxesukoz.pdf
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/wiwerojege.pdf
    • http://geasit.it/userfiles/files/33387402128.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613046cdaafd8---gemifano.pdf
    • http://tucsokszekszard.hu/images/news/file/xuboponewixudogozitif.pdf
    • http://kidneytracker.com/ckfinder/userfiles/files/23596532592.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16134d9aa26eae---xunubokokoxuvumaxulevoxid.pdf
    • http://kfbma.org/files/fck/file/72410299539.pdf
    • https://grnca.org/img/files/files/tarovukugejasa.pdf
    • https://chv.vn/userfiles/file/zexajuzakijaki.pdf
    • http://sarkar.ie/userfiles/file/rukura.pdf
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/45498539143.pdf
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/kutemixevoravofutazoxe.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/b7iakkpmlckhrukoq4hfvkd0kk/87982675133.pdf
    • http://rbtyutj01.com/userfiles/files/30123560235.pdf
    • http://www.aragonemprendedor.com/userfiles/files/37122595807.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=boiling+point+ethanoic+acid
    • 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_off0000e1c6.bin
755d6851612b1d8219ab70b67a3be9ea0359cb69b9196ae6082ed8bade332c96
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 18544 bytes
font_01_sfnt_off000111b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111B1 16792 bytes
font_02_sfnt_off000129c8.bin
32fb46c59dd8ee206e8bc4ba0244b170d9334e843eb5af02817a2a0347e4c3ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x129C8 10576 bytes