Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd9036dbb9e063f…

MALICIOUS

PDF

86.4 KB Created: 2021-09-09 05:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f67b493a93b3a24addf60d7a0e0a1c2 SHA-1: 7122544b31c718d6a2d915f75d0a06666d47cf5d SHA-256: 0cd9036dbb9e063fe06ecdcffa5130efd927e4035d27411bdd9443f6aed1c91d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of PDF link farm heuristics further supports the attack pattern of directing users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://thanuyentea.com/ckfinder/userfiles/files/ronodubenegutezagux.pdf In PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/kopobikaretolubat.pdfIn PDF document text
    • http://strandedtattoo.net/file/4907563278.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133aec1f1698---zujolulilegorokawi.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/26257753833.pdfIn PDF document text
    • http://halanmilk.com/upload/files/zasadota.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/pamajabibujurexukarezab.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/38450368809.pdfIn PDF document text
    • https://promise-land.com/upload/file/gekovavijigasumutemoku.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/99866769794.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/27547760352.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16133203aa60c3---wugawewaxikinumebun.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/50313229994.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613169978b3b0---43493501477.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/50410356424.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/bijifilujewanapipa.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/ratozomavana.pdfIn PDF document text
    • http://ore-processing.ru/d/files/86535083494.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/40340431330.pdfIn PDF document text
    • http://enewind.com/pliki/file/jugikaxiziligenetarus.pdfIn PDF document text
    • http://computerdoki.hu/user/file/27795698318.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/vonemurepotowolokor.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/30827960979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=hellbound+heart+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_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 18324 bytes
SHA-256: 443f07fae61634efdc1672584434ce0564e11a42202225d616f3589aa2a4fdca
font_01_sfnt_off00011cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 10568 bytes
SHA-256: 2c92662f97f7a715e808fdc3011496ff74b64e671695646c79e781d9a901bf9d
font_02_sfnt_off000134a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1