Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e3585609e66933f…

MALICIOUS

PDF

83.5 KB Created: 2021-08-17 04:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d3663f56bba26088b3e55bd392f79003 SHA-1: 439107a08f1599373556af6489611c9531826a38 SHA-256: 2e3585609e66933fddf9abd46a1f5fa1c16f1432018ecac72e0e7c2b79986a9c
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farms pointing to compromised WordPress upload directories and other domains, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://cructi.ru/uplcv?utm_term=how+to+set+date+and+time+in+fitpro+watch PDF link annotation
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/mg1gbnodvpv5bbbmfefvgh3kq8/kovanidolitifasovizesa.pdfIn PDF document text
    • http://planbmedia.hu/files/2457836095.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/24007717674.pdfIn PDF document text
    • https://hirurgija.me//files/74688102828.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/zorutebojugizobavokofi.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/r63enq3lmo0bvdg4anrc01ckjn/kagebibomoviraxadutu.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/29430057485.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/16760562218.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/voledexugexoj.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/73552692490.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/gofewubowadunew.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/45770520199.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/bcv2oan74uqn58kccfb9ht4oc2/6933548945.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/fenevuzigelixak.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/pofezolovamesogokaxa.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/lixovu.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/691e2e6a6b2120e5a4da1abdb7913600/97522525197.pdfIn PDF document text
    • http://stillwaterponies83.com/clients/74660/File/90985639733.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/af392c575a3c57ad5feebabf0dfd44af/17954103393.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/76910753984.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/bejulazafititovilamunulum.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/3af2f721df7cd7fca53e2c4f8b01eba5/85409367377.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/m40fid7tuqfjeg5qfkmmihng92/gelolijolu.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/wuzin.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/suzijelipogopobenasofadum.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/gidumegazolejorosisavi.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_off0000e236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE236 10916 bytes
SHA-256: 03c4826b1f546f79f60f3a8f6e01acfdc09d7e0de852f9ee638d49b22858dbca
font_01_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11363 16812 bytes
SHA-256: a8e016aaa5d6f1e07e21b21ad08cdb1b020bb660f203d1084ebf8bbc2f16963e

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