Malicious PDF — malware analysis report

Static analysis result for SHA-256 af24c2882031bdcd…

MALICIOUS

PDF

88.2 KB Created: 2021-08-02 09:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7a18bd3b5d7acdaa2374dda0878b08d6 SHA-1: 955142f466eb7066e007d431ec92c0ed2382a777 SHA-256: af24c2882031bdcd1870b679c5d1d0151910f3d1601705b5808f9a3fd8b34f28
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to distribute a second-stage payload. The presence of embedded URLs and the nature of the link farms point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=how+do+i+schedule+an+uber+for+later PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607080999b774---55450258053.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/gegopoboduja.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c218869769c---14365043680.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/xobudebokibez.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/30534452218.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb1b015b4c---64231310666.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/poforerow.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e2eeec02c---kumopewuvanipakeweweda.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/dogilaz.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/xarewimitikexijilepemim.pdfIn PDF document text
    • http://markone-tools.com/upload/files/mizajipokudujaxasanojod.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/f0934f98b25067962d991754af871e83/gorutogufewadirulavefoti.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/vopexek.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160852c5981060---73485818588.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/52b12f4d5200e5169b31ec26c7124c1a/zotodavevetukogagoz.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160807e5a68b7b---xiwiwuzosa.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/cec74769a385be01eaabbc494da89fe9/13050552940.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/839ec10298cdf2b832d233725c9d0e22/6713225262.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d83543b71---9337369270.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/12266644130.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/29776152045.pdfIn PDF document text
    • http://wearebryants.com/clients/3/3b/3bb22ab34fb8fe691aabc4d0498f9caa/File/xexiretanusorupadedi.pdfIn PDF document text
    • http://brucemaymemorialgolftournament.com/clients/d/d2/d245e0393a5bbb16d67b82808c007790/File/gesajeguwarufalelo.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/pijofetafe.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/zirabelez.pdfIn PDF document text
    • http://billcolletterealtor.com/clients/e/ef/efe7172bdc9c6addedf700543cb5cb37/File/40358751300.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_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0E 17272 bytes
SHA-256: a282a94091043beb67986dc2568f82b290587cc65a73331a8609197ba89be920
font_02_sfnt_off000138d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D9 10888 bytes
SHA-256: 617b12970f04520b4875696e2646fd9f0fc04dc60b70afc4a10ed838a4aec024

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