Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d9921a835441e2…

MALICIOUS

PDF

108.1 KB Created: 2021-06-27 03:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 45cc1746fb96cc916f83f2b5f0f71a9e SHA-1: 7a08c37f46f315fc48ff6d0a31e24cdad649fa3b SHA-256: d7d9921a835441e24950f658dd7b0e32278de0574cf70c2ae059eac303e4c824
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate structure for distributing links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c902dde1188---depudegotipaz.pdf In PDF document text
    • http://urduhadith.org/survey/userfiles/files/90910368969.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/keresixawowavip.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ef41e9dff---59943485729.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c8150bcb7414cd252b04f5fc5286edc4/64730144373.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b49a96014---30401123611.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/1j77esgumhihmscv13a1u3k7rp/91530604998.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/49543142465.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe38cd7152---tematonakotekikabe.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/moserividomonajazoso.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b0ece4b66d087ad719e344367d828071/79860584614.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/ecfd206bdc848984aee97e98aad57b69/29204979529.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/suvujefukeretozo.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160703f6d5de7b---majisifutanopede.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/65657388406.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/fac2b9068a8ac7feb332309329db298d/97857150687.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ab74df196---66379091135.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/53819766758.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/1422311879.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/13012434050.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609891c44957f---51307481238.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0f4d2287dd9e1c2ec734eb9990b04ca5/48605904672.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49e5eabc58---kesawurulizowifojafeleme.pdfIn PDF document text
    • http://webursitet.org/Files/file/55649838228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+hobbit+an+unexpected+journey+full+movie+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_off00014197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14197 17960 bytes
SHA-256: 644080b5195c6e243ee23825c88daaea680770c409a17a5a683f2a5d49fef859
font_01_sfnt_off00016fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FC5 11516 bytes
SHA-256: 14133439b158401273dca3567bc81f56bf16f5c1df280acbe761cea615f14653
font_02_sfnt_off00018a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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