Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c1a760ea27ba7c…

MALICIOUS

PDF

106.4 KB Created: 2021-07-14 08:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 039fcf0019848f563663865b88259ff5 SHA-1: 2ddcb7093650ee5368f671971efe88e36930e23e SHA-256: d0c1a760ea27ba7c43404fb5f408e42ec75c7b4b57bf2478350da18bbffd1595
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to potentially compromised websites and disposable hosting, characteristic of a link farm used to distribute malicious content or phish for credentials. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://saigondome.com/uploads/userfiles/file/rapovolokobelatudida.pdf In PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/vorumumifolipeg.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ecqbk2eka1an0dgok6ea2ia33j/52210864526.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/0ec83cfb703ebce62794a50553a3db0f/98985762963.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/q0m6pietr5su9pb691c1ku53o2/xanewugu.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd238ba783---69228708282.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/jogozifitazewunux.pdfIn PDF document text
    • https://buka.ru/sadm_files/64946783018.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dccf139bf7d---50682036690.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160db33f1a897a---80922815993.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/nubowafupovujifabi.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/vetusuzod.pdfIn PDF document text
    • http://thaide.org/userfiles/file/74940489620.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a41efeba4e1---zegemifolixaluwu.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5dee0be06---pireruzukojivudunojinuk.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/74334189638.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/rupus.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/64067458238.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a76f331f8be---kubonetila.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/766362ccc8a6574febd0d4d04b873f19/51406107943.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/248ffc5154e1e8337453b9befb5963fc/97594807660.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cff3bd9d8---1051499095.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc8c4697c6---33583353411.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/dasodefawo.pdfIn PDF document text
    • https://zold-kommando.hu/files/31416609589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=forensic+science+chapter+5+review+questions+answersPDF 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_off00013c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001549d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1549D 17416 bytes
SHA-256: a3d6f9e2d492ffb210c99054909fafa4d3606585173859490c53752d77cbe071
font_02_sfnt_off0001824d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1824D 10932 bytes
SHA-256: 965e3795f2ac0b7be96cdf1ced3ab017a926d90733601a41e0af3fdcdf72a83a