Malicious PDF — malware analysis report

Static analysis result for SHA-256 493da79e616a7903…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 21:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c8594810d36a4fb578b378da79d139b8 SHA-1: a44836f3b4e5c0647fbe249c4605e7355edab12e SHA-256: 493da79e616a7903da5176e11b8959a3187aab908d87b38b0823e5aaaa1be227
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=jspdf+autotable+header+border PDF link annotation
    • http://wsm.hk/images/uploadfiles/file/kivanuluxolaritofokerube.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160da0ba604fe5---fapedizovoluwufuxib.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe03d9dab---62097993132.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/5427901506.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/femazaw.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/26614317200.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/9ttp15fb1a34o02cgjkotm1l4b/pazazejazewototarefuzan.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/92574598521.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/munebimanafemitexuwasu.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9e87e9c92---xudugulas.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/1581544843.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d09f5324c0c---xokemapuvazuvi.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/57595443774.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/15869393419.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/berijirapar.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/5d90d3c55e938f165a30a12144d348ff/37733171488.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/123f8f3e9575144ba4d4a7195c20d241/lorafizuja.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/3a0bdcb35d4621fba0710e268988b88f/80869062196.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/j9vip06ehmg6jd4u9i2qvu1hnm/gadovegagesojoxanirifuxu.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/gonefi.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d57c940b24b---95330664837.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/10452759105.pdfIn PDF document text
    • http://pk.mo/userfiles/file/tenijubufagafu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD246 10632 bytes
SHA-256: c6f16522239e5be6505b6fb1f80ccbf72363019bed86532e8459f6801518f443
font_01_sfnt_off0000ea85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10297 18236 bytes
SHA-256: 077e6c6e7a3feaa41b7e5e74b4da2434e2a69d0d6052c51eedc39c1470b7b003

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