Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee2ca18e507ce9a…

MALICIOUS

PDF

76.5 KB Created: 2021-09-19 23:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2bd457739adcc314145ee0349dc396a5 SHA-1: 53a1e60ca7135b0e76f6130706f0eb79bfa2de1b SHA-256: aee2ca18e507ce9af37cb851142f740beb11a2221ac7560413cb0969c6e07472
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141274b3bf57---46093173933.pdf In PDF document text
    • http://automsystem.com/UploadFile/file/20210912081147633.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/rosilowumi.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/gesilegasuv.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/basonekikutoni.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/jibufo.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/36cc2250ae43f2f901344b2070bf653d/19272327811.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/89673198841.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/fuxen.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/vumidisowudab.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/fobabiluwekuzibalevokapi.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135881e60df7---mirajal.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/xojeleberirebelirak.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/39918504310.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/nomamazijekew.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/94032306284.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/robosumolegikegukiteve.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/58612924926.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5b69ec413bd67fd08ffc7e4786d6a2dc/bedefurajelaxezitared.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143cd956809c---51470709120.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/xarumamezesapopa.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/nttonelm4bn5cfc1h74q21rhfp/79149217998.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/55391796739.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/43197131505.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/bijonuzabijot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=rockstar+mp3+song+download+pagalworld+mp4PDF 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_off0000c607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC607 11104 bytes
SHA-256: 2d1c0cbaa3f157dd4803faffa2b9b3e0102dd9ade90a8f5a05f7883868427416
font_01_sfnt_off0000dfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 17172 bytes
SHA-256: 3d93f68bb50ffab17fd0c29dd96d96c5670b4bc4f5908e76b173bd68aa84e9cf

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