Malicious PDF — malware analysis report

Static analysis result for SHA-256 1845f6e0125b2af9…

MALICIOUS

PDF

90.4 KB Created: 2021-07-23 12:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 93e643b0c045d973b2fc7ea8b03a8d88 SHA-1: 05e61d870556c29af34ae37c3c38c2af1aef914d SHA-256: 1845f6e0125b2af91419eb161fad44fe9ac5d019e6b6c0156f6c86485f69c326
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supporting the nature of the content. The primary attack pattern involves luring users through a malicious attachment to a site that hosts further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c9c223885---nizofonotunifejelezud.pdf In PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2a31a50a10d628968821aa036d0c3792/kumame.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/22966990022.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/66248751852.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/6c6c802ae2972ff8c2ff609905578033/pewuzadoj.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/121e662691c784d233968896c48434d5/31885064149.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/40965280524.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/bevitebabinofe.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/lezadatozoge.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085701812f2d---7118204552.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/a1084e7a45da63a00da1efd3c7e3ca9e/zafadidug.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/766f2943869d08c7be0b46885f441a41/pogelodug.pdfIn PDF document text
    • http://com123.vn/uploads/file/2410856670.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160837e2c98122---sifurisosoz.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/18336638712.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082698f32c9e---11217245704.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/84405672537.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/38630469414.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/87561263615.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6b8c698be---51951184434.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0741a24e8c---wekirajowe.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/bobuzupozowaxejolifemuwi.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c29684682fb---36121291986.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/3mhvcdsrsv2gr3t6i2dtcueoo1/14251445552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pegged+meaning+in+teluguPDF 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_off0000fb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 18472 bytes
SHA-256: c9fd5f0019d471475c81ece747d7435e59220826954e8fda58eb225fd45a058d
font_01_sfnt_off00012bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB8 10304 bytes
SHA-256: 77f625e0a7c1d093113e3fec3ad7079d4058f15efcad21bf4e4c70e985f74d22
font_02_sfnt_off000142a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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