Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21a21d51e2f948c…

MALICIOUS

PDF

99.5 KB Created: 2021-08-04 04:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fce136b99658b361191783eefdad96d7 SHA-1: 2a606186d17f834ccf27479da1f15083ece4a442 SHA-256: a21a21d51e2f948cd4197b75bae5592d5f3b8390d95ad65ecafa8b846b942488
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as a lure for an advance-fee scam, likely involving lottery winnings or parcel delivery. Multiple heuristics indicate a link farm structure pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and heuristic findings strongly suggest an intent to deceive users into a financial scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa97d10f0---61063825229.pdf In PDF document text
    • http://alituncer.com/userfiles/file/97660105121.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2075075b06---46638346643.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/536eafb0f2ed1a5c102bde742cc9e3fd/rupinabijifidaji.pdfIn PDF document text
    • http://soles2walk.cz/data/file/29101692594.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/likameganukixesukuvix.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/vadezimotabajosotivi.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901e83cba45---86381991002.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/fb042c1792cb2a2696a4b489dbcdbf66/ratetajesogitijarav.pdfIn PDF document text
    • http://kme-kme.cz/files/file/sedifulelogowigipadan.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/jeropafumisug.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/96877621477.pdfIn PDF document text
    • https://adikkedua.com/contents//files/61112365097.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/zutapep.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/ef6022bc2092ff7fe68584d0195c11e1/67336964945.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/tidifi.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e05116f54---79198182535.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/802302c8e5ee9f2f38e2f82676400650/girexo.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/tadomuzikavizuzasasu.pdfIn PDF document text
    • http://mcutech.net/files/10299664693.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1392775560ef0d165877fa34a68851c0/lafebozi.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/naxop.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c37352ad75---29730289930.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa127a0e2---61507269415.pdfIn PDF document text
    • https://yellowstonewildlife.com/98373988629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=what+az+scratcher+has+the+best+oddsPDF link annotation
    • 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_off00011dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DA 10420 bytes
SHA-256: f702b71d8aa0df8b9328f22eab07718dc4bad66c2936fd37031ffa4c57d2d360
font_02_sfnt_off00014da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA9 18728 bytes
SHA-256: 3442c0a4f2fdbf0b5bca5a687a5602823ebdacb4e69b1f3fe93bc6760149966d