Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df2700cb690eae4…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 20:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 30762f9ba5dc6491e233a9c7fe74bc7a SHA-1: d8ae9c6d9774f87573ac798aeef75c265077bf07 SHA-256: 4df2700cb690eae44d87ad01b037d2b82d0f0873b926502262b2588f9bf99660
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. It contains embedded JavaScript and numerous URLs pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of embedded JavaScript indicates a potential for client-side exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=sat+physics+pdf+download PDF link annotation
    • https://felicitareonline.ro/ckfinder/userfiles/files/givuzegazisezaja.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/famabikagavoxokemikafu.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160721e99c1fb6---53089661512.pdfIn PDF document text
    • http://toonesk.com/upload/41620562402.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/59735235553.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/16fbb728f41768fc2edb7bc7da2756a2/80913632358.pdfIn PDF document text
    • http://runhouchem.com/upload/files/rifiketinunuwawedarurafow.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/piduxipereg.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/60017680749.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/72599033932.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/samukuwuxalabugabetik.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b16ff8a69c---xujixapazexefakamadure.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c747b01de2---girukonipidufejokazalo.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/39423589147.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/64354094735.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/ranopojisaze.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/vixifapuwosivolejoweluzo.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/86640257878.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a8c8c1dae---23399322409.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/3997501221.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c9501d23ed70f887fcacb6bee0f3af19/nurejesedove.pdfIn PDF document text
    • http://zimmerei-possert.at/70011924233.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/womukamiwudiworogamo.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/36676312674.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be1aeb8026---pikigalozalop.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/70886120436.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_off0000d601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD601 19028 bytes
SHA-256: 52586a9442d333e331ca6c07213c64438e3baf406f3d550262a8a07f84c6f597
font_01_sfnt_off0001070d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070D 10760 bytes
SHA-256: 27cb7a7059efd834bdeecba2d2bc62940e45c1ccc2d44cb283d7f1dd79c39b1d
font_02_sfnt_off00011fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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