Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1e90012fb1877f…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 09:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3c1342af4ac522ee43e10f69b584b356 SHA-1: 9c559cb685a1059933d527ad90c7945735ab1341 SHA-256: 7d1e90012fb1877feca74bd2607749c7e29d8b17afc452bc80d7d033b8a0885c
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which are hosted on compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the link farm heuristic suggests an attempt to direct users to potentially harmful content. No scripts were extracted, but the primary attack pattern involves directing users to external, likely malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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://kompassztuki.pl/Image/files/nomobomedegetaxizok.pdf In PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/1b008cb7e733dd181c7f223325ae06c3/72157909154.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/65137601587.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/8092665450.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/37544114904.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/885ee3f295cf5159352ba65e52330986/43895608579.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/zunovodexuwupixeg.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/xonerawovopadoxajo.pdfIn PDF document text
    • https://33mobility.net/uploads/files/99990886526.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/fepefimugoxatuvopu.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/6bf2bb0891b86ffe4cfca6381d5b7c70/jodek.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/42180631709.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/gutujusajoxa.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/72407717050.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/petig.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/xuzarujebobidizisepuwo.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/jamumibaxodufopo.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d1a4d754f79205e6f230addcd26b374/femomopumefi.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/23843085611.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/d729eebf042e9a5a4cf4f4a2d83bf8d2/buxorotuwoteguzimojikuj.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/f3ae54a4d014ff77ddadeb2a707ee229/81968739317.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161376b5723cb1---24807592242.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/81211233590.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/bomuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=online+games+shooting+gamesPDF 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_off0000d51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51B 10480 bytes
SHA-256: 8384fe1988db232974b4bbdd810d7317577cc58b63149c629d2e129cc1107e5d
font_01_sfnt_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 16872 bytes
SHA-256: 28943ce615c73a13a033cbbd1aa46c31120985c785724f32efde913dbea349c5
font_02_sfnt_off0001188a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1