Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a05cec7d7566834…

MALICIOUS

PDF

68.2 KB Created: 2021-10-09 13:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4df7beb778d2d5914cac15c237054685 SHA-1: 57df1202b23044d70a86f0c96034241e62b6c209 SHA-256: 1a05cec7d7566834ce4cf0dd16e99690c6fbe5ba0c7126ea75fc8d6c63fa5675
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, typical of phishing, with embedded links pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://huntic.ru/uplcv?utm_term=kinds+of+plagiarism PDF link annotation
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152dcf1c6c6f---94027218879.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f29e3564a4---75682424843.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1632556147.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/36606585963.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/bofiwezupagivesawo.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/widunulipukis.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b6a004b734---gilojusaxuzamuzotatigesi.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/gugirerumifaxivarazekeme.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/bozimakipipofeb.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109101250557103.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/buronosidugiwolamupolul.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/93692437888.pdfIn PDF document text
    • http://alefart.ru/admin/ckfinder/userfiles/files/wexutekidit.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/ligelajoxakivarew.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/kirizudojewebugirojaz.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/51763524900.pdfIn PDF document text
    • http://offokin.ru/sites/default/files/file/tawumabumuturaxovenev.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/wijipegesematuregegego.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/93528337222.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/21831297113.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/mezudoninugazolojufedenu.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/44420543802.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/kinixabaruvevotuwojupafe.pdfIn PDF document text
    • 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_off0000b08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08C 14180 bytes
SHA-256: 1a373955cb38cdd7f2fd65aa4abc84f3a30fcb53247aa908a86c3b3b52572460
font_01_sfnt_off0000d3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE4 10600 bytes
SHA-256: 483160e424ffd0515673bf308fc0ffeaa227dbd53f03e68be28f7a27a5a06036

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