Malicious PDF — malware analysis report

Static analysis result for SHA-256 d912bf1f936ee0d6…

MALICIOUS

PDF

76.0 KB Created: 2021-08-31 05:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee22e1eed3af2d98fa1c5d68b41d3469 SHA-1: a9bb04f7c50ec7357dbce86d3d0db62e1468eabb SHA-256: d912bf1f936ee0d61de704fbb3ebd5650020db5ec30f3e8ab5526f72c7958772
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. The primary function appears to be acting as a link farm to redirect users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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=skillful+listening+and+speaking+1+teacher%27s+book+pdf PDF link annotation
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0c3715e1c8b04c4e258620f9de70c410/rateg.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/bimobimumupezim.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/879feb2a624a86473b74bae3f21e82a2/50395089342.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b863d412e79---jirevibapitikisotalak.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/hm0vk2cm0kqhn8acti98ar3tt8/69120101369.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210806184220.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/jumuteju.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/i13ld9kov82ort7iqoo8ffjd53/69493906163.pdfIn PDF document text
    • http://dr-temt.ru/images/file/fonexugifaferunawozewi.pdfIn PDF document text
    • https://service-panev.com/userfiles/vepifupavol.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852f019bca0---digaludi.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfea3080704---sezipugenadedoja.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20218111541187837.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/dujedisagopofew.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d4e5830c4---58135372587.pdfIn PDF document text
    • https://securitydm.com/slicice/file/zabotivuturijaraj.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/18833989519.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/49432454595.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f5f751444ee7ad32806202b8084822ae/nalibepuxusadojoxijim.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/5256982027.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/c0p41cv3blc1cec3k7ghe22avc/12091322091.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/99262110124.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/96798449572.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_off0000c76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76D 15480 bytes
SHA-256: 1d0e17aefc58ac1c86cfe3c008980d4dceefa654e6b13eb381024a490b4a2f40
font_01_sfnt_off0000ee80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 11392 bytes
SHA-256: a14c5aac785c7b1bc35b5bbc269c6cae85f0447961d71b6d39bbcbfb4505b4f5

Open this report in the interactive analyzer, or submit your own file for analysis.