Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c42c9c8d042658e…

MALICIOUS

PDF

75.8 KB Created: 2021-09-06 22:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9292a86d599656875c02c647c635ccec SHA-1: f383f9865d1e4d3c52d76268ab5bc1372c504ffe SHA-256: 4c42c9c8d042658e5eee59a8da913a31d705790cbe082008d579204cda7a1ad9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan distribution vehicle. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The primary purpose appears to be to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://thefencedocumentary.com/adminfiles/file/foxozebiviwifagonejuke.pdf
    • http://planet-for-events.de/userfiles/file/femowazedalupajivige.pdf
    • http://ngnjl.com/userfiles/files/zonijokavejenejar.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/q81bb00il5p82delv192m52882/15861252634.pdf
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/lisija.pdf
    • http://snap-drone.com/userfiles/file/gekitaxodugizavabapidinod.pdf
    • http://sushi-belovo.ru/files/rakamafevudigizavipo.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6999b44b0590f5a8b320f5ae7781dbf8/tumutes.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/92f913192305bdf9a7c9b2e383589a34/jakuxakevim.pdf
    • http://musorcentrum.hu/files/article/file/75493741111.pdf
    • http://tikatalog.sk/_files/file/74710011084.pdf
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/mamuwetavaxoxoragurel.pdf
    • http://banghetretunhien.com/media/ftp/file/zumozavoso.pdf
    • http://promador.pl/userfiles/file/pikute.pdf
    • https://stockbauer.hu/uploads/file/88436008963.pdf
    • http://marymo.ru/uploads/files/33025436846.pdf
    • http://goodfortune.hk/UpLoadFile/file///lumiwavozuw.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/37876579729.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/rueinqr4hooau19u6gvt2pmdva/zufirogowebiv.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafd8c7d0de---33414054806.pdf
    • http://asianmosaicnyc.com/userfiles/file/85683814049.pdf
    • http://sebatmakina.com/files/tuvofofemasoru.pdf
    • https://wheelmartthailand.com/image/upload/File/nokixiguwigater.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pathfinder+cleric+spell+list+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_off0000c586.bin
aa9a93c4c5b863fe188d495c1ae2bc6181055a39a13a0f3fe32b9ae9ca545374
pdf-font-stream PDF embedded font (sfnt) at offset 0xC586 10600 bytes
font_01_sfnt_off0000dd9d.bin
aad7dd9d6670b53079e343aca1df54475f8fdc7bb6e805fdf6e6e21c50266fe8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 17152 bytes
font_02_sfnt_off00010988.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 16792 bytes