Malicious PDF — malware analysis report

Static analysis result for SHA-256 84262df523f392a0…

MALICIOUS

PDF

85.8 KB Created: 2021-08-22 04:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ac37c19d8536981e6ce4f1249f0b4cc SHA-1: 3b3d28e1d012e6ad1e5b6a7ee37f8cdc71ef4672 SHA-256: 84262df523f392a0db75bf7c486f9bd3af405fa8449a4b2e665c659d263974c6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to host malicious content. The 'SE_INVOICE_LURE' and 'SE_CALLBACK_LURE' heuristics indicate the document may be disguised as an invoice or a support-related notification to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://doks-films.com/pcms/content/file/18077559981.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cad809d11---8076552735.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/c95d275ce90f318bbdf6225127efca1a/60777629507.pdf
    • http://dietetyka-24.pl/images/files/33637509851.pdf
    • http://hoaisonland.vn/upload/files/gabifubotolutivijezuziwiz.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/86000532120.pdf
    • https://towa-aaa.jp/userfiles/file/15938601790.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b39628149a73934d5356e0bed11ddf42/rodonipedanilerosevana.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/81shlf95sbkphrl1652jg5rjm1/15142682122.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/2e302d6006ec0ed23f42630e1107512c/83554428612.pdf
    • http://ikcem.org/userfiles/file///43131657932.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f250c455508---97466191580.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeb8e9cff3---2865955110.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/4c5832f74540cc7a90650d37e853bbaa/gogepisanedawe.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610e62bc5c95d---nisel.pdf
    • http://www.motorradfreunde-toggenburg.ch/up/files/17951182873.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/rd30vdkfkgp7rn4g3jhah0vlak/62877047518.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/add3b3fc0e8eeddc01dc87f7b5dd9ae1/28350006432.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/16473653958.pdf
    • https://tortugafilms.ca/adminfiles/file/mapesofepinisexabome.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/5906d0ac0273d2a5f4e8be81860474ce/10380410490.pdf
    • http://mywayrtk.info/userfiles/file/15859909074.pdf
    • http://custom-mugs-factory.com/uploadfile/files/19427381095.pdf
    • http://naturalmis.com/userfiles/file/45169007745.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e40b78bb---67802000429.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16093b5a77bb93---63170057289.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+i+get+my+western+union+number
    • 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_off0000e8c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 16792 bytes
font_01_sfnt_off000100dc.bin
977316d2cc443191c5579d683e9e8c4ba9681e0941909adf62f24186bbd39e3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x100DC 10812 bytes
font_02_sfnt_off0001199a.bin
d739ccce33420e478ee0c8cc724df147f20f4dc1bcf561a726e05a819fe6dbfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1199A 17436 bytes