Malicious PDF — malware analysis report

Static analysis result for SHA-256 4baf8aea350368af…

MALICIOUS

PDF

90.6 KB Created: 2021-09-01 01:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 50e7813b2441b5a521d04a2e5b2a7f4d SHA-1: 56ebf898d657169c5cd5577f3598b10c899d5372 SHA-256: 4baf8aea350368afc923a51bf43521422d33190bb1c58f5f584c2464f123a615
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://amghanoi.com/images/ckeditor/files/71577751046.pdf In PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610348d2e6484---wotopizemuxuvivura.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/zabanadubipofok.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/6733843785.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c13bb7c47a---96066713172.pdfIn PDF document text
    • http://labonscafe.com/userfiles/78290125269.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/duxesewesadinesitajane.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63f755a8e0---18806608863.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/xixaxetibazosuninuro.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3badb7cbb1---papebelujawijusuvunovutu.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/aca36073cc97ba1bcbdcc1f5c59e992c/62953738975.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/v3jkgdgail4jd3e49i5kde0bt0/3465696306.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/xebamituxewafirus.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcf5e8966e---welakiselinunanuludatodo.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/gezarewikumiderasirus.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/eb4070b318c9c4ae047095d267241ba3/21426224220.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f98b1e363---24153893673.pdfIn PDF document text
    • https://mszukam.pl/dat//file/10756800956.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021073118111668.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/fifojejalotosi.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/favifegud.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/4a5d31930e4c75e410e72233b87896bb/49399082199.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/56575051401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=rain+cats+and+dogsPDF 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_off0000ff4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4F 17608 bytes
SHA-256: e5f39e41863bc9828418ace549749dc1d0f856c8ddb81ab60be95931a597dbc7
font_01_sfnt_off00012cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC5 10312 bytes
SHA-256: 6b6ee1a7308f09cd29b838fd7045a5e4effec111ecd6b40ae06c9a85e352bb02
font_02_sfnt_off000143f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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