Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98726abd51c67c8…

MALICIOUS

PDF

82.4 KB Created: 2021-08-23 09:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 02aab6ce5a0da1833244ccd00871263e SHA-1: 46baf1da1d75c7d0ba395b9e03b232ef45f3cfed SHA-256: d98726abd51c67c8cc7e2217e759fb4e6a1c58790d9a4e0c5cc59298daa51f7b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/071c58863043f21294a974344e048958/62515317692.pdf In PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160adbdc9da13e---14065892289.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/86193572577.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/49732351444.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/i06vlcnq7bdd6l7tjf9i7q27a3/43900632736.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/mogizod.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/84277506419.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/1d3bda5ffceb3155d08c3333b2cf2089/witoro.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/70243069088.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/81892765547.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/5714fd66bdacca59de6763378359b2c3/66352187530.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0db71c8d8---245772448.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/tipusunuvufifanotojam.pdfIn PDF document text
    • https://seerupit.dk/assens/file/xurosiwoku.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ri3eo9ehf1ltaand3angkmpvpn/13407263795.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/q511nb35movg9jpkev0b53vn74/46880655862.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/80dfd39d047913222a9b5b5a98f89d57/85382306581.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/7960380552.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/27930562499.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161029b5ff2a22---sutujobukafokavonofe.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/5e6ede44415c44239a4e3877983a53d1/14707988564.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/piforerunomejoguf.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/miwogikilikogagazotos.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/80667341081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=free+candy+axe+codesPDF 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_off0000dc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC75 10320 bytes
SHA-256: 7975723a5f722aa26cfd1c8e42bd920f8f2591feb07d664fef97812bdf5fe328
font_01_sfnt_off0000f3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 18548 bytes
SHA-256: 9cb4f4a0a00aa2fddbc309e3ade20216d9dfd846d90b2b61e2077059feabacc8
font_02_sfnt_off00012311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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