Malicious PDF — malware analysis report

Static analysis result for SHA-256 c413c3363e3a7cc3…

MALICIOUS

PDF

101.0 KB Created: 2021-07-31 14:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bd0e677fb42e16ca4032ebfc47494a92 SHA-1: 6e652d4a2472b306ea9932478956810e60de0e2f SHA-256: c413c3363e3a7cc391b0cdedde56965ef3eac44fd7359fbe44fa14c1c46f6a31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs and link farm heuristics, indicating an attempt to redirect users to potentially compromised or malicious websites. The presence of external URIs and link farms suggests a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://ketchas.ru/uplcv?utm_term=how+to+use+nurse+hatty+ketone+strips PDF link annotation
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606f11558951d---panezujeratabofivesavabo.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/28219253583.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/jexef.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8f0daccff---lonotalutiwugasewupisanuv.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/21770608093.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/32001671937.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/joxigaremizufag.pdfIn PDF document text
    • http://araonline.hu/uploads/file/77919510377.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbf0d6c26e---38596704027.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/wosovegisujesiwup.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/kunixavitajasiwegep.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/22ad9e08cc1ccfef746dfdfa88313f2b/62036387486.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/lilogejuminuxedokafimi.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/kifilumufeposipopevaj.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee84d98237---27283189390.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/da9gl8qk9ul7kolab3pca5a3n2/52311364534.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7b0e7a10f---71499043585.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/3f7370389d4ccb9d51244ac31e572a67/23560727182.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/7hjut3ectclnepth69nk10lh40/mixurifadekijo.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/68318346042.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050623073873499.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/13881683106.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/1274906489.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/nilizawixovijojojafes.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160afb712e7da0---61691074383.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_off00012886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12886 10684 bytes
SHA-256: 756006e8179f1f166806a99961ff136cbcd989c416df2abec3af7de459a87a24
font_01_sfnt_off0001410b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410B 17144 bytes
SHA-256: e2bb19b5f6717c35c2824023279df4d3a0da4099d9cf6263648c9e49eb3c12ab
font_02_sfnt_off00016d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1