Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7c7146332a4582…

MALICIOUS

PDF

74.0 KB Created: 2021-09-13 20:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fd7242021b312d78c8e88628eb9c4c59 SHA-1: 99f3d5ada10fac99a8602d8c1a591f657372141e SHA-256: 8f7c7146332a4582484d94ecf7789fc8e42983507321ab77e692bd4045582080
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://synerhu.ru/uplcv?utm_term=letters+with+o PDF link annotation
    • https://aadhaarretail.com/administrator/imagetemp/file/86753373901.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/dijejuj.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/fusife.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/27200401876.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae5334c786---2452664954.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/28019011030.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/wotapezujawajop.pdfIn PDF document text
    • http://greenglobepms.com/uploads/81395394022.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/sokagasotapewarutewe.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/64942653581.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/dojugod.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139d999692e5---16528146534.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/tuwobunifapegarizokoto.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210911045322.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bebce38a4---tefateroj.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/a621a3c6cda52bf573fbb63e0953e719/88481134970.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f74744337591b755414cbff358ab78c1/95855741851.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/68026425307.pdfIn PDF document text
    • http://hadt.vn/upload/files/1006149928.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/89628921666.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379d7f7f6c8---jejegetitadobowiramimerad.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/juvipozuz.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613615e05bda8---61451570983.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/logufefan.pdfIn PDF document text
    • http://xsteelstock.com/d/files/fezugi.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/79213789493.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/xejazodabureserubiv.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136820b0b457---42453284819.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_off0000c25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25D 16320 bytes
SHA-256: d46075fc884b9d077371bdf15113b1c8189802b8e39383192e90dd00bcd39873
font_01_sfnt_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 9936 bytes
SHA-256: f81a1043edac9f4e9a486536815655544e0fff87f9493d83832c8e4dd5cfa726

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