Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e2b5faca3a1c27…

MALICIOUS

PDF

88.1 KB Created: 2021-09-15 14:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff106144607b44b3ab8739866c1f3db1 SHA-1: 3375c3d55a381890c0bda539bbe2e03eccf0f70a SHA-256: 63e2b5faca3a1c27712b4c2a1a2e007e290bc01b88a857b0021af2ecce9d3302
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which appear to be compromised CMS uploads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to download a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pes.edu.mn/ckfinder/userfiles/files/kezugokab.pdf In PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/48472473569.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/legibabovur.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/54992183461.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff451a3869---xomizujerifijamuxodo.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614123ddd2568---76257447900.pdfIn PDF document text
    • http://nemalipics.com/30501503899.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613900567831b---22943827757.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/refinoz.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/zosufotupipaf.pdfIn PDF document text
    • https://luminex.pl/upload/file/gavakunaki.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/80507648177.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/20648851348.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/lerizolalitapisitoriv.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/31331650220.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/7f17fdb4c4c3d8668b33485022b25aec/3469515640.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210904/16307139258189.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/varizunoko.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1630665496.pdfIn PDF document text
    • http://flomojapan.com/upload/files/fijixemetejitirusozif.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/47425702707.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/56012551263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=highly+compressed+ppsspp+gamePDF 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_off0000f23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 18664 bytes
SHA-256: 47b001ce309da2b76852f46832b89e8e090cbff9beb9c938651777034bc1c389
font_02_sfnt_off00013a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3E 10864 bytes
SHA-256: 2b55a24cf46b8a45a82b891edc0b6a592f4fd4328017ea009e91117b984177ae

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