Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c6dca155ddbc8d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 02:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b7cc04965318e042ba8d2d29e1b065ce SHA-1: 63bbe29d9d98b86f754b5205cfe5ff7a52525bff SHA-256: 12c6dca155ddbc8dc68ab28f006cc525481c7fa518c11e3372b65b39936a5787
104 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites and a deceptive download button lure, indicating an attempt to trick users into downloading malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attack pattern. No scripts were extracted, limiting the analysis to the document's structure and embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=stop+spam+on+android PDF link annotation
    • http://terwaarde.be/ckfinder/userfiles/files/fajupe.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/zulirofog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d079b11fc---66234114848.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f7f90662c2ed10d37aa2d62ca4c0559d/tuwigusuf.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/fubejolemipi.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/5c67299daa5d620cf1d7e703966537b9/56395628844.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/nazunajaxewut.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/xivelafevedutero.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/34882145212.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/92127675465.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/pewiloxiboxureke.pdfIn PDF document text
    • http://ternovykh.ru/content/file/998528093.pdfIn PDF document text
    • http://efrex.cz/files/file/sagatewutelanikodu.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/43480195096.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/xuzifezisefosokepozamav.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/86323144627.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/xomef.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/97867403595.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109031359416518.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348f295af12---misorefusonujesuj.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/67060720570.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/dusibavude.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/28408056932.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/mosewaregeja.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210915220601.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_off0000dad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 10448 bytes
SHA-256: 7a6481140e8ba8d80fb0dc3e1366654733ba1c0df5ee5f047ae7fe9c734590ce
font_02_sfnt_off00010a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 17764 bytes
SHA-256: 7b1ad8d1269133398ca512ff1d506b95b396e17e6371eed082907bf4032817d1

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