Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4308e6e7232506…

MALICIOUS

PDF

90.1 KB Created: 2021-08-15 00:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 66d5237397ca64b6acb05a676ad36dc6 SHA-1: 911100c4544728c3e4f8af22d81ffb0e04589663 SHA-256: 5c4308e6e72325062e8fadcec8d84fcba37a3dbbc013f6ff87e9fc57fb2cd624
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV both flagged this file as malicious, specifically as a phishing trojan. The embedded links suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://pixomot.ru/uplcv?utm_term=el+diario+de+los+escritores+de+la+libertad+erin+gruwell+pdf PDF link annotation
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/e06da85cf95103522beeddd8eceac502/toxofivedagegudomemobik.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085099b59e89---xezuvimaw.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/p0dv3hu7h962rlqbaoe9nkvgmg/34926242631.pdfIn PDF document text
    • https://latework.cz/soubory/kowewifovobon.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/6548357310.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/niwisarulegopenozuwe.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/wunurososedavanizozonaje.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210731_A077013BB1B23566.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/66f68486b33c8b495571c3fda5a96d13/17124091925.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/17686330172.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/rimane.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/60621008184.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5f3f620a2f85156ee822d7c8cbe641a9/7711347929.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/f834d95a49efefa2efebf41f2a0bb685/modosazijefosudujot.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/pofowila.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1daec7894---73288013639.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9334aa6ec2---76782314839.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608016b2305da---fogipewisopulutimewuz.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/91215696824.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/rawarelo.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/45322255957.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/f6ron3pcg8q8ojr24o9j8ieqt8/54090880679.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/gan9tmo4253icd4i37c5th56j2/86953838328.pdfIn PDF document text
    • http://phsclassof1970.com/clients/875774/File/bewinevadiromisogefexid.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/pidezeferadaj.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/zenunirefasepaj.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_off0000f649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E60 11104 bytes
SHA-256: 4e1ca46ba587530d466cdc62c503417eeb0278cf69daa2bc6102b54cc02ceae4
font_02_sfnt_off000127fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FC 18692 bytes
SHA-256: 2e73ef56189bd99df0cf4a79040a5fab05ec8f033fc622de64c6debc0d0895ae

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