Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80e2497131210ae…

MALICIOUS

PDF

89.6 KB Created: 2021-09-20 03:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f38b470a9e7d00e97e26b925c7e95551 SHA-1: ce80fe92a67ffe00f780d3d79272b3b01ba10a66 SHA-256: b80e2497131210aef5936714b1125c26e35a4ded80a2d0591c315b2d7890f36d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple PDF files hosted on various domains, some of which appear to be compromised WordPress sites. The presence of multiple external URIs and link farm heuristics suggests the document is designed to redirect users to external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.physedu.in/newsite/userfiles/files/42777489508.pdf In PDF document text
    • http://abpjseah.news-read.com/upload/files/gosege.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/50146337222.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/pr85og8ek5c5a35bvfuuedr131/16016234214.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/tifagupugudodawo.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/6966469778.pdfIn PDF document text
    • http://healthywithhart.com/res/file/15733120102.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/paxituzol.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/24359448717.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/9644071073.pdfIn PDF document text
    • http://apismorava.eu/docs/64704192807.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/kinapisaxabumedinabe.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9fccda62---61227042678.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/89455782696.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/40066302898.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/48779543771.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/siduvatej.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/54813763387.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/loruzavajukarawejufijax.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/suxawofoje.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c2efeccddf714e1b4821d2cd50aee2b/41846968752.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210909102501.pdfIn PDF document text
    • https://menu2uplus.com/images/file/gamuvulekolepedaporidap.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/73837271197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=terraria+full+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_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 18584 bytes
SHA-256: 5b31eb7a3b0999529ac7c9d3697c0879b318380b1311c6d08fc49b93e6be7651
font_02_sfnt_off0001424e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424E 10132 bytes
SHA-256: 14b458fb24c65a9bdea3f77dfa16eb06d94301501a9091de05dadc203f76823c

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