Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cd941de16bc790…

MALICIOUS

PDF

114.2 KB Created: 2021-07-06 14:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 291ed5f4cbf5e3170b45664cb8a7b0eb SHA-1: 09e1cefe2b39edf4dc50b685162d297020c3af6d SHA-256: c3cd941de16bc7909673904d0f085ee2f8b2d497c14f4c6ef5e6513bf5ba4c54
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4750da3508---25721697127.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a82910822ff---liluverataxakubizuvubet.pdf
    • https://pt2-turbo-j3t.com/contents//files/fevurasagagowenabiluluzep.pdf
    • http://aaaexpressac.com/userfiles/file/12328498258.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160860892b35c6---33729719944.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e0350a10e18cc87f559ce3120832964a/wapafajamemijuvoniseve.pdf
    • https://szaktel.hu/uploads/file/29160249373.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be799487c85---rasuxefabuk.pdf
    • http://diysmart.net/userfiles/file/womisolusurisivurofeves.pdf
    • http://www.aamuhsv-madisonalumni.org/files/files/64938920121.pdf
    • http://tevukasveza.lt/ckfinder/userfiles/files/55142294264.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/322395e4a9140e776a9984e68af8e653/fenobete.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d83eede5a---71691984229.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a0cc37d3a96768aa7ee197a44d3aa6a4/jaremagozu.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/fufojopebepamosuxejaxaw.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4c2006cce---7239686838.pdf
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60369473271.pdf
    • https://clove7.com/userfiles/file/ginuserezolinoxoka.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160796e203c08e---91224273078.pdf
    • https://biorenta.lt/ckfinder/userfiles/files/47389239625.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f5c60d88a---37075018284.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be4e858604e---96735836198.pdf
    • http://zonweringbelgie.com/ckfinder/userfiles/files/89715277449.pdf
    • https://blokhol.com/upload/files/33492230977.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/8b7e95e1e34673b81a84e17d4ed83d7f/senovifizimalelugadubefa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=comparing+and+ordering+real+numbers+worksheet+answer+key
    • 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_off00015e43.bin
aeffdfb595fb05b521e4e0f4304d0965a95a74b7d5fc2c42b93fdadfbe097429
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E43 16300 bytes
font_01_sfnt_off0001880c.bin
dab4548b21d31a5f3bb8c70785ab13ef8dab4896d8abfaf3e967f297992a9a65
pdf-font-stream PDF embedded font (sfnt) at offset 0x1880C 11404 bytes
font_02_sfnt_off0001a264.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A264 16792 bytes