Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b4cff9fe67159d…

MALICIOUS

PDF

72.3 KB Created: 2021-09-18 15:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 48b0a2c8ef6bfe5b61b56a904637634b SHA-1: 136522ab755407395a9ef12c151d7f35c6f609f7 SHA-256: c6b4cff9fe67159d343d2cbd041ed548ad85a1a16879697bd4a10520f01d4b06
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to external URLs suggests the document is designed to redirect users to phishing sites or download further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the document is part of a link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://standardamulet.com/files/files/28378748297.pdf In PDF document text
    • https://kcss.hu/korosi/userfiles/file/3019084186.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d07c4d8d72---zozumizesudoravapawa.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/sumevifuforunebajofirezo.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/sobidupupotatoda.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/retozexuvegebozajilun.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109102242201228.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/gedem.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210914112733.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/94833585902.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/12740456840.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411494845e9---mazifanasilem.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/pogibotivot.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/59292694271.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/81860108375.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/81081768788.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136502c24ca6---45826702006.pdfIn PDF document text
    • http://ave-france.com/pics/files/51903256897.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/bozenaxitetotumizajiraka.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/zurowojuxe.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/68978628115.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360fcada282---vasalodegaxizasuduzaliban.pdfIn PDF document text
    • http://evola.it/userfiles/files/tiwalejuvulajalawopin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=rooter+galaxy+s9PDF 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_off0000b8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CE 10516 bytes
SHA-256: 49bc7b94fbb7e18da81fda9f07addcfdbcc34f442c9f553f317779b2506d8db6
font_01_sfnt_off0000d102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD102 16584 bytes
SHA-256: 036d728ba6a34df3b8415bf2fe0575cc52fe907e5f622d3925babcf3cd5ac34a
font_02_sfnt_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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