Malicious PDF — malware analysis report

Static analysis result for SHA-256 01318fc59da4bc48…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 22:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3baee5d0a7994b3a1cafea5c9eb595ee SHA-1: d92401fa5d81dac93dddff3768e8e2be30f9a5d1 SHA-256: 01318fc59da4bc48cd027bc057f2213547f13b5b35ed1a2c21c213283ae60bde
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic further indicates that the document's content is designed to trick users into clicking these links, likely to download a second-stage payload. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://catamma.ru/uplcv?utm_term=payment+receipt+format+pdf PDF link annotation
    • https://ludifrance.fr/userfiles/file/bupazemakitikozigutefepeb.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/8800570208.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/sozove.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/48959562063.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/xulopesipigazipabojorofip.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/84404479970.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/73657000542.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/87073955951.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/11846742141.pdfIn PDF document text
    • http://planetamama.ru/files/file/40966280218.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/ziketowixedufutefisima.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e95374497ed---16764662847.pdfIn PDF document text
    • http://beijingteye.com/upload/files/55371573926.pdfIn PDF document text
    • https://mmszke.hu/files/file/67920667221.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/25838703934.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/75360213353.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a15844ce5d8---10756651671.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/nogisabuboferunulexule.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/4961756074.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/satuk.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/91989915540.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1f9e92aad---fogenekupaseripezewe.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/1411356683.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/33803302831.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/11837261072.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9E 17608 bytes
SHA-256: 9c1bd93bd05dfce2207d723e4f8015509f9e5e79f227b4176b19df59690e80e3
font_01_sfnt_off00010a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12277 10684 bytes
SHA-256: f8f2fcc920d64357c2a0d56208dc67df71f95ba2851eeaa47fd7fd50da462988

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