Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61b31f6b22e011c…

MALICIOUS

PDF

91.2 KB Created: 2021-08-14 02:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba70cbcad1afa8a9b5841f9ba23ce48f SHA-1: e4195bfa6a88ae44f7103740d22438b4b6d8d421 SHA-256: f61b31f6b22e011cd5e6ee194c11f6f94e990af72d4fb94db064173e1c457a41
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://iaestedresden.de/userfiles/file/rewesori.pdf In PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/goxate.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d249cd0e8a2---36458545771.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e183cd34df7---dapofafuminete.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/11692276728.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd48c7ac35---82596036964.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210704/210704120734234851v611teslrzg0.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/xepafadamojosa.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa350e80d---65590868121.pdfIn PDF document text
    • https://actorconseil.com/files/file/42738544992.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b431c84148c---49157725695.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/16235856446.pdfIn PDF document text
    • http://wshs67rocks.com/clients/9/94/942520bde836a0b401740df6f3d23d35/File/20096343524.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/kujipajogedaxifigagaje.pdfIn PDF document text
    • https://taperagi.com/contents//files/wopibotamimaxe.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a879c58bc---zilukumomedebamavo.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/55536672839.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b70c56195b5---37757936505.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/fejakuf.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/14760332594.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/felotuwamojaladitakusek.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfc8486e29---dudurojodim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=advantages+of+using+purposive+sampling+pdfPDF 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_off0000fe86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE86 10988 bytes
SHA-256: 88586f626a26e1bb695a36db889005522ee23b80707e7b2ddfaf03fd9d46c445
font_01_sfnt_off000117df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DF 18156 bytes
SHA-256: f97b011b549799d0406464524f215a72c60aa1e7204979f51441c2224c1cf692
font_02_sfnt_off0001465c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1465C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.