Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5321a83d81d6ea…

MALICIOUS

PDF

73.7 KB Created: 2021-09-23 21:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b26828a1dcccdc82293655e26414aeb7 SHA-1: 267c15f9f84aabb67938cfe55536106baec69256 SHA-256: dc5321a83d81d6ea390638b1d3ade7bea76e4c97d8ce3547819d908ee6f3ff80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://oniceh.ru/uplcv?utm_term=how+often+do+otters+eat PDF link annotation
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c97778471f4008576da0460de7624b56/tixazekemiletupinali.pdfIn PDF document text
    • http://tongdingjixie.com/d/files/79159244715.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/kozirowim.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139d53c4f690---71711638173.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/tomekadalebabakususewuwen.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/tovasezujijejavekewanu.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/rexewuxekidazazupefilude.pdfIn PDF document text
    • http://parentini.it/userfiles/files/selopap.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/nexowazaf.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/xepidetozofivukuwaf.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613688e0e45a9---41775899695.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/5993938877.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/35008427797.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/39540359548.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/195130673.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/xomasil.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/bixegofitob.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/77761029448.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/zajigume.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210907_215125.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/81317181017.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/55197615450.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/78635776227.pdfIn PDF document text
    • https://websbag.com/uploads/files/lovifif.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/mozetabuwekawenufememiko.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/0233ece6def8717800f5c3eb9affc20a/putadidez.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/vokasubezirijirawafog.pdfIn PDF document text
    • 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_off0000c185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC185 10284 bytes
SHA-256: b287b3a5857979cf9925f766c1c2a0068bb3587e71809a3378ed79c5f9834be1
font_01_sfnt_off0000d8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D4 15860 bytes
SHA-256: 91a421f2050168a5e8db0d3782ef1b9a61637ac4571a55df4c22bcd7573b83c0
font_02_sfnt_off00010154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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