Malicious PDF — malware analysis report

Static analysis result for SHA-256 05019c4afd05e461…

MALICIOUS

PDF

103.0 KB Created: 2021-09-09 03:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa3fc08dc28f2152aff06b3521edddee SHA-1: 2d26fe20eacae89febac26cb494b2059d45ee9c9 SHA-256: 05019c4afd05e461a54cfb233d61fa465d9725236f246ee40b1e57412ba15891
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the overall structure and URL analysis point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://hotelalbicia.com/userfiles/file/95295635299.pdf
    • http://kapsalonvogue.nl/files/file/72738167079.pdf
    • http://kroonzuivel.nl/ckfinder/userfiles/files/97406270275.pdf
    • http://ed-union05.ru/files/file/lugabivuxepisawe.pdf
    • https://millvalley.com/wysiwygfiles/file/poxidujakefaxuwe.pdf
    • https://brianspradlin.com/userfiles/file/zubekesulukavofeb.pdf
    • http://fitsiluet.cz/data/file/ziturijemivugik.pdf
    • http://mexxeopaint.com/upload/files/videsosuwu.pdf
    • http://wakabaeducation.com/userfiles/file/fukabebebejunekomikom.pdf
    • http://studiomalpocher.it/userfiles/files/67809125038.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ba0cf31ae---81048543674.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161357550b0b63---zotenotosujevefadinomux.pdf
    • http://daltan.hu/userfiles/file/46374179169.pdf
    • http://movediary.com/userfiles/file/34616553971.pdf
    • http://cartonwrappingmachine.com/userfiles/file/84210517009.pdf
    • http://palirna-frydek.cz/uploaded/file/bokogitipowavuwil.pdf
    • https://namhunglogistic.vn/site/files/72105984801.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e79418b1b---tusobikuwobijujoxisejoge.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161394446c31a9---26690264806.pdf
    • https://wodepcb.cn/uploadfiles/files/38387795040.pdf
    • http://nprofit.hk/userfiles/fasapoxu.pdf
    • http://kraski-chernila.ru/resources/file/bedovujafadoxojoses.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=de+profundis+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d50.bin
4aaba5269cc8b99a033072833dbf45612ba24629f5379780ce33ad0acff2f03a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D50 10284 bytes
font_01_sfnt_off00014489.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14489 16792 bytes
font_02_sfnt_off00015c9b.bin
df8aba38c69fbf4e04abd6898b7769b1117a621d2e250d066b44a4dc1d669aa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C9B 19340 bytes

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