Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d49223cfa524e71…

MALICIOUS

PDF

102.0 KB Created: 2021-07-13 16:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fb9d5b5075b1912e7fb44c97591ce2e0 SHA-1: 0ac4800a6217503f1d9fc7c0addb2c55939000cc SHA-256: 3d49223cfa524e71a0a411920b0750924a8b723682a757604dd0ec828cbf9935
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm to distribute malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this behavior. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16086513ac0c89---wagatolinegiba.pdf In PDF document text
    • http://eortak.com/img/fck_temp/file/fudifelozemirelawareje.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160876fd01aab1---potigujurabadap.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17811a333---matisirozapete.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8ec953f4956d0416c26d40e7ae8d1d43/88991059873.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2aa912be96---nigowefadonivilogulag.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/46383424104.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/70f3f365aca8e814778f051d57223393/48270083555.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/gopojuzik.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/25827639297.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/98251948355.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/47118212002.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/gefediwemilobobusiwatila.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/b8944584a6d320a9d82a2e8f6d076112/bagomuvidefurinirexalo.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/nunodafi.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a82cb9efdd9---pibidufodazetajafijeluv.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41af8ebfef---994659029.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/dpd39mp8n1ddmoe3tksjm4ordq/51102697415.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/kebotametexuwur.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/rattc4c75g288vvtaukcfp83ak/42457859670.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210621044453.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/146be762f8cdf480ba4d12588a42aa30/59054361572.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/19372534062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=suction+curettage+for+hydatidiform+molePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B14 17604 bytes
SHA-256: 9f01ccb252ced78369b61c22a9205b519a008082b34fae51c0dcefe7e3485aeb
font_01_sfnt_off00015910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17127 11044 bytes
SHA-256: dc86e59806ab525d3f4b5e1d55d4f48b2fc2ecf34b519e941df3fb057b6d8b45

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