Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5070f3e4f41d3b…

MALICIOUS

PDF

105.3 KB Created: 2021-06-25 22:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7bff1421f7d36cb3e9d8b5a1b204b369 SHA-1: afc1ff4792af4d7fc5de1896025e8927b013c43b SHA-256: 2a5070f3e4f41d3b8ddc8a61650a0aa979ea7f72baf4a14a3752951bed0f32c6
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. These links are likely intended to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://wisserarm.nl/app/webroot/files/userfiles/files/xobijurebovezoxamowegisa.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4403c0df86---fagukuxusuvaw.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fac801ef5---mofawi.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/87eba1524982804aa70e1c09bd033aaa/zinopudizaxupodudaweruz.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16079d59c144d3---4140483723.pdf
    • http://adabaskimerkezi.com/upload/file/23083649874.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/n7okii6cf0kl6k85v70ertabtt/nawunoxofiweberojur.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/09lfd02628i4jn1981f4ontbca/robeguvufawigi.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/54bb051ec164e5637f08c562d219e78d/10116086440.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c254245b334---panokagulaw.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/54c8d4a147f672e3824a31d8ddf729cb/85717316017.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609828054ae1c---namawaradevaje.pdf
    • http://vaness-sens.fr/ckfinder/userfiles/files/75365453482.pdf
    • http://vladjurnalist.ru/archive/file/65353683683.pdf
    • http://rheumatology.instituteupload/content/file/65126043497.pdf
    • https://dineflon.com//files/dikop.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc00e04f936---90224782365.pdf
    • http://allycatering.com/userfiles/75092428184.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adfd9a0888---taregimonurinupinepo.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aebd7aa2043---61517795652.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1vls8ccmsd0ark62hi5bi7dsr0/mamarowuzogenevunogojup.pdf
    • http://kco.su/userfiles/file/44830294168.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=covalent+bond+or+ionic+bond
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839a9a39c40---faxizomigesatatepubi.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_off00013318.bin
a9ef6dc44f87431ab0dd459033762b09b38aeaf7c310dd45ce0b6a719e88467c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13318 20716 bytes
font_01_sfnt_off000167da.bin
a4f5e4a600c83ae57038b9df296fc7d831fe51c4635589da87f7c4d9002f11a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x167DA 10432 bytes
font_02_sfnt_off00017fa9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17FA9 16792 bytes