Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f809d60aeee734…

MALICIOUS

PDF

97.6 KB Created: 2021-08-03 03:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dfb5feed502ef687c3b855a90b0bff32 SHA-1: 6c88355b823e5892dece07156646d67c6a527360 SHA-256: 23f809d60aeee734477a7ee3f20c91d021559fbee41f5ebcd27070d82caa09ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://aexpress.lv/index/images/up/file/laxozepozosoneto.pdf In PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608767891bad3---41205899975.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/14463651138.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/kukusagagerodudote.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8bda31ac0---vusototumajusazo.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/10771abd9d7920f5ed84f0a944630761/jatagagasugijire.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5c34f342e---37800390764.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/50388741600.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/20498353228.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c3160435135---63902994666.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744b2ce8485---61843467186.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4bfb3e6da75f9bf9744d26adbd0cad6f/33399844448.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16088362436aa3---54850192144.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/birutulebikaxokapisixupo.pdfIn PDF document text
    • https://yellowstonewildlife.com/98737318787.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/vavisoxofamebugitekul.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b7b27616fb0508bed8d1aef0e1759147/dizugozuxigomigofitalelo.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084b99113dc0---29918133399.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78c66dc160---70169221429.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/f4a5bc5cfbe6884e3207f626599eadec/mujofomepoferopurikudo.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/2oj3n6ajfu9muoctjkko5rc7aj/xagir.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34aa40cbe8---dewebosuxopab.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/51464122082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=problemas+resueltos+de+ecuaciones+logaritmicas+y+exponencialesPDF link annotation
    • 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_off0001120d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1F 19252 bytes
SHA-256: 5a2893ffd70e71636b52dc5efb847ca02b6b31aef9c3e6eac1c6a207df4382e0
font_02_sfnt_off00015b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B76 11312 bytes
SHA-256: 24b34ebfb44939965e9b2cd018ef5620e0b97f50cfcf44a5903051a017428d30