Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e519b37b310a46…

MALICIOUS

PDF

80.2 KB Created: 2021-08-30 02:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: cdf91854da9f26e999325fa6b56e80f6 SHA-1: a960d8dde014ad27bca394b06551a18efc9b8357 SHA-256: 40e519b37b310a465bb8115a29c24a279be4735ad147dfabfef7367ced450b97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of these links points towards an attempt to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/828e42c5fc5747491d1957db2d3a57ef/88504509014.pdf In PDF document text
    • https://ijpdua.com/contents//files/26214796456.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606efe461dab7---zudok.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea61e54d0f---bivobufosazep.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/35719897261.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/77831618804.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/dotilugatawoxarin.pdfIn PDF document text
    • http://soupworld.de/upload/file/wedutamobokavifuju.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/27648054493.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/53013766343.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/palodulefopota.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/5529437486.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/30619261201.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/liganizazotuboxatusin.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f352ae037b---56072756829.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/99030561139.pdfIn PDF document text
    • http://keitbg.com/images/files/9504315156.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b620543191cebca72c0eff1ff7fded36/lutagezipasorezapona.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100356d7ab33---76892843709.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/rurifotiromovabopiged.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/99033584296.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7a24c5b5c---63254576785.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/dhp3uin50luir7c4vivk4a262f/17757288144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=all+worked+up+crossword+cluePDF 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_off0000d560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD560 17904 bytes
SHA-256: 1907f3b903ec5e4c0173f470167de5a07620fa86d31f8b948c5a5e37dff06791
font_01_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 10312 bytes
SHA-256: 75c976e566f8976ecae3abfce239c620a4909ca7d058f64ba5fd3b696548be34
font_02_sfnt_off00011a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1