Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fcd8823202153b…

MALICIOUS

PDF

68.7 KB Created: 2021-09-15 09:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98e03c339d3ed4e6056eaf0ec06ef9a1 SHA-1: 1519472a9a2d06c6bbe3c73292fcc478a14f2a34 SHA-256: 81fcd8823202153b08bef50d12f69bf98337a8ed13c610f6ad820536a31aa0c1
176 Risk Score

Malware Insights

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

The PDF is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's an image-based lure designed to trick users into clicking links. The document contains a large number of URLs, many pointing to compromised CMS upload directories, suggesting a link farm used to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4e9186c3b---64442138740.pdf In PDF document text
    • http://clingac.com/d/files/togulifelu.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210905_FB05D3B962A26934.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/59530498749.pdfIn PDF document text
    • https://ottopianos.nl/files/fuxebikigo.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/pawafidujavizaxe.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/37884171713.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202195112216079.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/rugigisafoniwojevanadim.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161326391a8dc1---lozesuxiru.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/89985854704.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/damidisid.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/85242032936.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/75157403170.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79671506243.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/zifijelamumubakanoxaxud.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/jikapudaregobirokefe.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/36278762910.pdfIn PDF document text
    • http://spiregene.com/image/files/20210901_100116.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/84b7601b6552cfdac7d811b7d96508e2/3243344590.pdfIn PDF document text
    • http://irinabailey.com/upload/files/71984723896.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/ruvufonomagogozexexug.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de91292d10---kofimalokoru.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd8cd1cf0---23413969397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=degree+and+radian+formulaPDF 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_off0000b2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0A 10532 bytes
SHA-256: 487225129c666183312f3dd6acdb9b0abb55105569ace39eeaf622fa951bce54
font_02_sfnt_off0000e2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 14016 bytes
SHA-256: 24a1ba402852a6811a264631280bf0bae887975ad4cb8a366685981b0ed0cef7

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