Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c218c759c199bd…

MALICIOUS

PDF

84.8 KB Created: 2021-07-05 06:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff0e8cb0f238a79c08ea74377ddc76d2 SHA-1: 311329c7c622a307b1a617c974f8a5efd8325c35 SHA-256: 78c218c759c199bdac80a44f276e5359467730fb873aa713974cd15028c15ae7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f42a046867020faec615fc0bf13b0ec9/73557018654.pdf
    • https://amblamy.ee/upload/file/95562719604.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bee90a90c6c---ziseliruvokagedakigodopo.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7c8d56fb---mafuxedad.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/eb56fed8c927faa593a1a7827cdf1ca7/82396663183.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/5a5e055b9527279a2d2fbc58974b32af/36294857323.pdf
    • http://esipro.lu/userfiles/file/debadivujapefugikapex.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f9d2e137a---18662645117.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e632e2115a---xolutabemulukono.pdf
    • https://olivier-daulte.com/ckfinder/userfiles/files/kubepefixa.pdf
    • http://sva-jeanroze.com/xmedia/file/71094253556.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e504ffec7ff498d010c10fd99dcb9de6/31859552404.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887f3a18108---zidakilese.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16079019d0cfa0---44679746831.pdf
    • https://perfecthospitals.com/ckfinder/userfiles/files/putabinakeverilo.pdf
    • http://www.alfapilates.pl/upload/file/69966068513.pdf
    • http://halongbaycruises.org/upload/files/neboxowilabigenurijef.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762534dc9be---32857605134.pdf
    • http://drivingschool-brno.eu/files/logepex.pdf
    • http://imreelectric.sk/uploads/file/16153614677.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=psychsim+5+expressing+emotion+answers
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fd6c1034d---rovaxilira.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_off0000e685.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE685 16792 bytes
font_01_sfnt_off0000fe97.bin
37ba5b51dfaa100e28138b585dd7af8c57db109b551d215e1fbedd895c416d88
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 17540 bytes
font_02_sfnt_off00012ba5.bin
7200149a631bbd2a18100e008d79b133200f84d4c25223e6dbb0740dd50b5bc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA5 11212 bytes