Malicious PDF — malware analysis report

Static analysis result for SHA-256 256cab852c34e2de…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 09:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b80077e388e838bb1ace5e8f4f5dffb2 SHA-1: 845f844cbf49d54c9db43226ce309b80567d173c SHA-256: 256cab852c34e2dec940389a1509db480173b38f9b4f77cf078c3d1acaa1a502
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://keluargamimpi2.com/contents/files/duredegedeberolubipa.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f99080959---tusibamamagatedexozakapa.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab275c57fcf---kesuzorotenopugaputudeg.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160beeef305dbd---16998634678.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/wukiwolebewudaweranosa.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/81336742726.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710179ee8f7---67735750340.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/85808099622.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/fodixezutilefi.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/88216533322.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cd9b84ffa9---tudibezanapiwubalijoj.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/pefakasusabemejuno.pdfIn PDF document text
    • http://jainfarms.com/uploads/sisefuzomofig.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/31666599667.pdfIn PDF document text
    • http://omni-links.com/64966196812.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/73425360469.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/6djdecrjg42ilupqrark78ks4a/23795617492.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/85894906681.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a50fd0f99---wugapasanip.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0159a0534b---pijudogufarupatemomun.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27d7507a1e---5907623624.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210612222702.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/zatemewugasexubi.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebc4553b66---59582391583.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/75919213851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=%CF%83%CE%B7%CE%BC%CE%B1%CF%84%CE%B1+%CE%BF%CE%B4%CE%B7%CE%B3%CE%B7%CF%83%CE%B7%CF%82+pdfPDF 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_off0000d6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 21476 bytes
SHA-256: f9141868536ad79fcbd2538cd5c44f971d974a5dad23e23d9630ccc2c835dd19
font_02_sfnt_off000124fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FD 10536 bytes
SHA-256: 8a202278fcfdf80f4ee1f0d2230af2197bf7d6d37f3a509f2daa4a621e3868bc

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