Malicious PDF — malware analysis report

Static analysis result for SHA-256 d205c93073168084…

MALICIOUS

PDF

82.7 KB Created: 2021-09-11 11:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a4f47545177e986b12af79e95839023 SHA-1: 11d09612354c00e1638d571649c8d75a9a17c66b SHA-256: d205c9307316808436ae08a6e569fdf3278d3321a58d9af02335179e7ecd90d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier score of 0.998 strongly indicate malicious intent. The document body is heavily obfuscated, but the heuristics and URLs reveal a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://basalyemek.com/ckfinder/userfiles/files/nudas.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/41bb4a4e0853429dd21a85ece2b51b8f/13546142613.pdf
    • https://sakesushimn.com/userfiles/files/juvelurixapasubokajukivam.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161316b1c5aee6---36091660442.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16133d1a9eedba---59237755752.pdf
    • http://metafelix.it/userfiles/files/34303364575.pdf
    • https://jahanchart.ir/data/files/file/85300201802.pdf
    • http://vanguardhungary.hu/userfiles/file/fader.pdf
    • http://enotecagaribaldi.it/userfiles/files/69048058794.pdf
    • http://www.northern-japan.com/image/upload/File/78835375436.pdf
    • http://medicaldistri.com/ckfinder_files/files/18963831563.pdf
    • https://dcmheavyequipment.com/admin/images/file/52860482927.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613309277e350---68221355611.pdf
    • http://siblom.ru/files/upload/file/98763527393.pdf
    • https://fundacjanadzieja.com/images/wyswig_images/file/95168131081.pdf
    • http://studiogeologicotrilobite.com/userfiles/files/24897864874.pdf
    • http://cadelupo.it/userfiles/files/81821293218.pdf
    • https://loonbedrijfschimmel.nl/userfiles/files/sokaxonobob.pdf
    • https://hsiaoying.com/userfiles/file/bujavinapujan.pdf
    • http://gamax-moto.cz/data/dokumenty/foxufanekizigozidiluven.pdf
    • http://bong-dem-long.org/upload/editor/files/xonivutexufa.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613848626cac5---48070980016.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+pubg+new+state
    • 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_off0000d8e1.bin
0beaff00474c64ece15f72bb7f842b981dc24aa0e6722951f78eef6ec00114fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 20168 bytes
font_01_sfnt_off00010d1c.bin
f4cf76064556e9a3b268f3089b15be3b44429a794b9a39e0215e028d0ce7675a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 10704 bytes
font_02_sfnt_off00012574.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12574 16792 bytes