Malicious PDF — malware analysis report

Static analysis result for SHA-256 defdb1a69debd71b…

MALICIOUS

PDF

120.0 KB Created: 2021-06-29 08:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 266929d8676dde78dc819644a1d5a685 SHA-1: 714af6643e4c0ca4e3019138f4ecf9d3aeccc0d0 SHA-256: defdb1a69debd71bcff1f3cc8e6c24ced5ccc83ca3821801c17f036f7e964ac7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to lead users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution. The document's structure and the nature of the URLs suggest it's intended as a lure, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://absigorta.come/file/dusidulujavisujinawalix.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae5e8ff52---67248328722.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd1f36ba65---rosotuvuvu.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f4dfb52e0dedc3519178ce429daa6a35/sesugapuvubodelovevagotu.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607199805e833---89608840128.pdf
    • http://ohappy.org/userData/board/file/xexuwenasoji.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081f5f149c89---jisijiminuk.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/034b176057150c3cc7f4eec864f18791/99554611602.pdf
    • https://aldaserwis.pl/ckfinder/userfiles/files/5767847916.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/4edb4301014e6e98b655dae76128b725/76835664032.pdf
    • http://songhandiban.com/uploadfile/file/2021062112191873499.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e55a55fe3---lukavunekedanoga.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16085e5357a699---zufofemenefawomij.pdf
    • https://andana.us/files/files/bukigivixozig.pdf
    • http://assistance.uz/images/shared/file/66584122446.pdf
    • http://sobsai.com/ckfinder/userfiles/files/26699197683.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/74663665272.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/74usu8baqsstb9rlvip1qnkkks/35593817691.pdf
    • https://chptravel.ir/data/file/42596901126.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160863201a8b70---wigur.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bc634fecac0---24874248029.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f08e88e063---84538531721.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072cb62c0ef9---67848780633.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c352bbb0996---wulegerekibik.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=not+only+but+also+both+and
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e9e.bin
5503bb12f2218f56bea1739a320e399feb3b8b9b12b57b7e9ace4be3c22fe99e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9E 35496 bytes
font_01_sfnt_off00017064.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17064 16792 bytes
font_02_sfnt_off00018876.bin
b71d24eab69bc8933af31c5738278cbcf715c37306e21105f30c465af2b263c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x18876 18292 bytes
font_03_sfnt_off0001b8f4.bin
711318d04f63be113941cd69ffc3c409a3aeafe6247316b11389745da1c641ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8F4 10352 bytes