Malicious PDF — malware analysis report

Static analysis result for SHA-256 18231496e5055c77…

MALICIOUS

PDF

99.9 KB Created: 2021-09-03 20:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dbd97a0869b8d78fcc285a155c1b3b60 SHA-1: d643cd34b75cb49abd973014ed4741c6b8ebee9a SHA-256: 18231496e5055c7707d777eded3a5bd0771efc5acb615a8ba7ef323f7fdf12d8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest malicious intent. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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://laborke.ru/uplcv?utm_term=best+manual+therapy+certification+for+physical+therapists PDF link annotation
    • http://svaz-podnikani.cz/files/file/vajozidinujisoroni.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/newotojofirad.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202108291645479640.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/bimonotozo.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/t2d76huj36l0pias4uag536csd/94917125479.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/4827229156.pdfIn PDF document text
    • http://szhlfz.net/upload/bulabopuweluvufabebifopa.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/lolaja.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/dewuzefulipa.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/vogusojativizugifafazul.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34a4718b51---95096610209.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/bavafolupuro.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0844309146---fajegakudakokimezumi.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c57cba252e---denolosebipuwew.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/83195140137.pdfIn PDF document text
    • http://getem.eu/files/file/10696284353.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/komojejarepamazi.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/kobokebugagejojinevosik.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/455575c6aaff3eb2699b9b414990b67c/85288684611.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607be86096729---43871391542.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946ffca5b83---91866194238.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/suzibiwufasokozaw.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/2152fa1d59f4647553995bcecae3e47a/kumikidafera.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/95337987621.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/33632019373.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0895a7de6---86809934634.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/8qm8o8aobmerfepltktc2djs16/61322986382.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_off00011aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AED 11012 bytes
SHA-256: 755701d2e21be4850870709479a535d6db919659110a9c5dc13e8c298fcfe01f
font_01_sfnt_off0001345e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345E 20732 bytes
SHA-256: 4673b48c9449b2dc07784bfed4fdb40c82a554eed7410d9109f3251f95e72926
font_02_sfnt_off000168e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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