Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6fcbd1b47a9247…

MALICIOUS

PDF

100.0 KB Created: 2021-08-19 06:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1278e15422b9e71f7048dc6aac1e46de SHA-1: 0e2668cf6dd6908994bb25eeddefa9ed4cea05a2 SHA-256: 0c6fcbd1b47a924766734b64f34190b8b582a720a2d4fd7c1aae25fba6b80704
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=ulysses+poem+explanation+in+tamil PDF link annotation
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/21cfc18b347dd196a8ab9e4ca1cc8d44/9850746671.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/c2e6117bf874f70c24c6a3691fe1af99/bikipinuzabede.pdfIn PDF document text
    • http://ave-france.com/pics/files/firimonobilebigijol.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085215ae4f80---rebivokipopijak.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6c464edf9---popobijinepofova.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/dk82isf0i3hc7t52qls2tm3864/21463498681.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ca0f4fe1d---kegotomebuve.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc0c29d477---4655058851.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/62vitmmccvelde2oj2rh554lf9/74629913256.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/26628434298.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/35847678926.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160720e28e2e2c---pibeko.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b3000bce56fbffae1a9788ea3db15c14/koligamunalonet.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/paselejigarigulivefuxoten.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c5376419582e6673f1142be3acfa5888/86978502580.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bbf5124d3---49591626849.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/49409994219.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/xuwifopisesolilifuvajefa.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/01lco0o2381vcivtec86lba131/mozexizalemibudit.pdfIn PDF document text
    • http://ttc-investco.com/img/files/10634734410.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ghsmpjkeaohldrdapa41fu3kij/17213176677.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/pexuzujopefapurizenazoj.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72589810910.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_off000125b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B0 17404 bytes
SHA-256: e4ccc99a77f6b8cc44601fa53c12652b0d9b916f3b21faa4c40eb1bb4eafc063
font_01_sfnt_off000152d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D0 10536 bytes
SHA-256: 1267701934c167350e33f4e0265c112e088b512e71460ac38b87d53ae862e004
font_02_sfnt_off00016ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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