Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfb67fc962d4172…

MALICIOUS

PDF

86.1 KB Created: 2021-07-23 20:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de2e095dc2e8fdc8c3690fc9da2647d8 SHA-1: 2afccf6abfdf452f38036e1159408a5deb58eab4 SHA-256: 4dfb67fc962d417205d25fc97cea9733daa4175d80f62b9065bec06b23a485f8
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms or disposable domains. The presence of numerous links, including one with a 'utm_term' parameter suggesting a lure, points towards an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://shethof.ch/cgi-bin/dynamisch/file/migagapafo.pdf
    • http://tpdw.pl/userfiles/file/jevawilifo.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606dce50acff2---kezizinaperej.pdf
    • http://sowitech.vn/upload/files/rimamerolivozus.pdf
    • http://homeopathyhk.com/files/3622789551.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/zififepatid.pdf
    • http://essuances.com/ckfinder/userfiles/files/xazub.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607803ece337b---91225508554.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098929ac3d8b---sosokurukeri.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097498041fad---tejularenaru.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160ab28013f5b8---nodilopugudegorudifuji.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088052408ed9---47244028756.pdf
    • http://inhome360.ru/admin/ckfinder/userfiles/files/95831698122.pdf
    • http://www.deco-interieure.com/userfiles/file/27433601439.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/o72ar42lnc16vkc9k5qo8r3d7k/kodaxa.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/gasetorag.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8ddcb5a6d---23551765607.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d4b4e92ad---20871431190.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/0dbc32181417643b3ace74d3c6a81a59/62561502479.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160831e2f7d369---kalutewilosopezumogig.pdf
    • https://bonacorsi.it/file/6134765312.pdf
    • https://almuhja.com/ckfinder/userfiles/files/fogivuwowogadox.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/5644301eb1e32be57c1a65c0a09b3b1f/jewufelide.pdf
    • http://scard.vn/app/webroot/uploads/files/palajav.pdf
    • https://ita.kru.ac.th/ckfinder/userfiles/files/51875336336.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+apply+for+a+bursary
    • 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_off0000eddc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 16792 bytes
font_01_sfnt_off000105ee.bin
c5330dd9408e50b71dd63e1053dfee19248ba40e19b6981b0b94289f847bf70a
pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 17340 bytes
font_02_sfnt_off00013339.bin
912746f06bc3e3922441f1a073da57af0052f5b16f421ea78dd1d4abcf1d5ea1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13339 10452 bytes