Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c2312f7db8eba2…

MALICIOUS

PDF

86.9 KB Created: 2021-09-10 03:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 17053d7c911f99fa80b96e0a98d25939 SHA-1: 30b725ee81c2d1826839b0d555d72a657fcf34d1 SHA-256: 55c2312f7db8eba23a7d9e2dc7e12385ba292efbd4fa073a3ddc48f1cd8dc768
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://lejonhund.com/upload/24556882396.pdf In PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133ee046a7b6---gusujab.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613925dc75d01---nijoverurifarimopu.pdfIn PDF document text
    • http://devveb.net/userfiles/file/44864568257.pdfIn PDF document text
    • http://byecook.com/ckupload/files/20211656245.pdfIn PDF document text
    • https://ptogel2.com/contents/files/rafakokejas.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/vudekusivafururaz.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/93624341080.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/pusizedoberuniwa.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/wovisudisekemekosowadik.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/87081896261.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/vapolokolakajilekujop.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/bumofuzalirisix.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/polisarakewi.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/susagonet.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/57780344770.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/81450041993.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/42706328073.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/10611077940.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/poicf2phil9g8q7ir3i1r9gb08/59597292825.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ms64jripakdust6f8lltfhevp2/46191713068.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/e3126f142c0f78da1b7e537a9a1eff05/powowetub.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/78700266568.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/30813498982.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210904120412.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/dutuxegokepofixiwewibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=everfocus+app+for+androidPDF 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_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 17180 bytes
SHA-256: 8c62a1cbed4e5be227a767e9447494cf22492e3b006fc526cd3b0affbcfb3aa7
font_01_sfnt_off00011da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA6 10620 bytes
SHA-256: 4930a88c2d255bb10f9c7b4394e78c42bd2978faf00227505c6507a2541921bc
font_02_sfnt_off00013610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1