Malicious PDF — malware analysis report

Static analysis result for SHA-256 1842fce0ffdf9f80…

MALICIOUS

PDF

84.1 KB Created: 2021-07-02 21:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 261ac3d6d895e47f4998d7f843da08d0 SHA-1: 40eb69bb07435f7c45378c7daab7d8ea7ea39508 SHA-256: 1842fce0ffdf9f803ae93385f9de57c5f846bb466083924de41aea0407c267ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm or a lure for downloading further payloads. The presence of external URIs and link farms strongly indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://coretry.ru/uplcv?utm_term=pdf+viewer+download+for+laptop PDF link annotation
    • http://techsystem.gr/data/uploads/ckeditor/files/makis.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/ret1fjg12vht050c5s0t0tdfb4/48965556648.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c0eb7fd79089430af396fdf9bdabb8d6/vubir.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d5b6bbe349fb496f59cdf94a4805c147/tesoxifosup.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/96920797315.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/cae0a00ce276474e88b430abb331b26b/sozedazeporugi.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/56257702364.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/pozoj.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/83844200129.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c720b0ef939---gugirukuvofuravovilonolox.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/81f6d370ea37daf1e096e7b0d64e0af7/bokowifixerugikasojafa.pdfIn PDF document text
    • https://agatanorek.com/files/file/38091038131.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/dajividawibajevebad.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/vaxunasekujixopafam.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/ralovajat.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607780f079dc4---xovibesaxifazo.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/k487fc7ltfoasprgvop2i7mds7/60324311353.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/93473328741.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/852a375c436308dc225b34bf9aad1824/digog.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/tgg99rfug5pl3q5hb185bbv768/6680177542.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/somikoze.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609068a5af460---29915677479.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/tonapedaku.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/18957177467.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16072f49cbacd5---81973482066.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63D 16792 bytes
SHA-256: 8ad78e5a60a02fdd82783d3b68dd0cc67f4a12b7b01551537a00d459700fbe2c
font_01_sfnt_off00011181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11181 10476 bytes
SHA-256: d90ac6b925a4b47166c5fd9af0cb42743b3be8846690441dd4d0c2821015d80a
font_02_sfnt_off00012973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1