Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3083f3b17b06d7…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 10:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1d252217a036680f072d4943131db1a SHA-1: 45c11b94a96b68bbb4da53cfbc492de942c2f43f SHA-256: cf3083f3b17b06d715032c592985c945d4e00b5f9d314766d4eb1827cd392ec9
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to external resources, many of which are hosted on disposable domains or compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of a 'download button' heuristic further supports the idea that the document is attempting to trick the user into clicking a link to download a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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=the+brain+fog+fix+pdf+download PDF link annotation
    • http://heaig.org/editor/ckfinder/userfiles/files/33436297637.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/53310836556.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/tuxogipiveberubojijuwem.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/towakipiliboda.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/81112135027.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/13949529302.pdfIn PDF document text
    • https://regenerateacademy.com/file/fenadujazevisonukulexi.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/gukokesoxupoxiwiwilexon.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/zamurevapazozetufowate.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/tulutabe.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/62053966781.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a901079d72---mudowefesam.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/59056259494.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/gituwi.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/luzogimuzasulezevisa.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/8096436368.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161314a98cb09b---26689316491.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/10463311317.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/10e6dc9f7058b0adce0684bee2cdd05c/zoxazolaporababog.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/lasutuxe.pdfIn PDF document text
    • http://halanmilk.com/upload/files/32911748415.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/44048909863.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/najixazebekigipubebojivep.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/gilegajiwifawiveso.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_off0000d034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD034 10804 bytes
SHA-256: 80fa0ad14cd98f4530ab48710230ab82cb607d2a5a9d8fe50ff9235a4b2433d9
font_01_sfnt_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 18224 bytes
SHA-256: 72b82f56ac34953f0982add32eebdb1b82417237e9f33bb48b724263fd27cdea
font_02_sfnt_off00011887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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