Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35d8e260768d179…

MALICIOUS

PDF

77.3 KB Created: 2021-09-05 01:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 636eaf89778a76efaffe84378856ee7d SHA-1: b03225d9c0427d948ba310ace291f766d5ac05c2 SHA-256: f35d8e260768d179eeede33e916c15b5290977dda4d30af32f102cb4976853db
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://medtravel.lv/images/hand_uploaded/files/67578358386.pdf In PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d04a501fd---86920450786.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c7dc1ce55---dufikopoje.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/702de361aec8e1b0331bf7ef9e00ffc4/wamumevogegopopimo.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd5e2ae668---pazodopolazovuxe.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210612071452.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/46950532552.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a572242c4ec---vofenutexatufano.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/tosemogipewemosurilaseze.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/46153031319.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/bf439b3dafa64976d58b1f827d9cede8/wenazunijifadov.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161211f886d830---91500201577.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/blrbdq4tf5to08mg41gts4jroq/gonawebisefe.pdfIn PDF document text
    • http://vkts.se/userfiles/file/pasedo.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/b4bb9b01dbd448d8acef74efefc94ba5/poxelidufitetetadudil.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3a8dd781c---72249966161.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/22161564218.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/2a47c3ea8b7d7815985e31b156110e4b/zinewam.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/83301915759.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///letugejolejivutu.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/gotafoxaguxukimazazo.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/k45i75clvn8msf9u67a0m7l412/58824232276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mission+indradhanush+vaccine+schedule+pdfPDF 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_off0000c949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC949 10780 bytes
SHA-256: f15f38c56fc5b6f9b0563dd0cd6796b828354c0294f9e7817f94fe2f409b9d2f
font_01_sfnt_off0000e203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE203 17380 bytes
SHA-256: f539d13c0217c96ee0fbbb239c8864c5e368128930fccba896e1853b2a9b3e02
font_02_sfnt_off00010fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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