Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5c5671907593fb…

MALICIOUS

PDF

94.7 KB Created: 2021-06-09 04:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 73074329a4c89f00e09cd27040df1dae SHA-1: 2a112cfb8a3f06cf0c5e23826b75a7a297a61433 SHA-256: 6d5c5671907593fb8dc6b6a8f14bedf19fc4e238d5e791aeaa0ff72d5459d4eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://synerhu.ru/uplcv?utm_term=download+attack+on+titan+season+1 PDF link annotation
    • http://geyikkimya.com/userfiles/upload/file/3009715289.pdfIn PDF document text
    • https://t2sc.me/userfiles/67833969260.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/91011708328.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9460d819b---jubenato.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/75320877563.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca72c0910f---zavapezevonejitawesibe.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/jojatujalodez.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/hih6bqiaf6l96ugm3pa9n32au0/23407397820.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0b9395301---gomutefabinag.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/monoto.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/84143a4dc529c9565a7b3e2a0c62e2a1/57881413155.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/18b970238a5f4ca0a79201756641a1bf/56204643487.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3889002d5---sirusoxugik.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff9cc774c5---wonugelezogotabutebab.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/j5nhvpf0nk9b9b7s3vrb8fkvpv/83891258928.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/kqbbc89iheuisok1pc2783kav3/36893284425.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/754e28d8aeb18806ede14b8d5357a912/78683352972.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 4120 bytes
SHA-256: e76029b4432ee76b60b9f6fceff8f16946d748e5dac5e7fdfdc8934a33e7f4f3
font_01_sfnt_off00010d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 5044 bytes
SHA-256: 83292de30d0511383dd37c2823fd0885c91219afa42ecf2a2b7b5854e617ba7a
font_02_sfnt_off00011ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE6 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_03_sfnt_off00012774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12774 14300 bytes
SHA-256: 5099b05b5b9dbce612d3a54560f9944a3c92ea54ad830e209de6878c3fdc4cb3
font_04_sfnt_off00015554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15554 16320 bytes
SHA-256: 3e19099dae9e8913dc2b12f2e7050f84e42423d143ea4d6225307ecd778fa4ae

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