Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab54f32f9b1b2a0b…

MALICIOUS

PDF

85.8 KB Created: 2021-08-30 16:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0554ebe18cf61b01b8a293705cd4311b SHA-1: cfca27dd9d11d23886185f5189f8c471ac3d20e9 SHA-256: ab54f32f9b1b2a0b6210e7cb6358003bd2c10d4da711435fb3f75249128afbf5
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it contains a link farm pointing to compromised websites, likely serving as a lure for users to download further malicious content. The presence of a visual download button reinforces this phishing-like attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/4c5832f74540cc7a90650d37e853bbaa/gogepisanedawe.pdf In PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210529020020.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af61ad7fee---vibep.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/fisojegemuwimedexavuta.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/21551212926.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfeed089cf---79022674375.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/nerav.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/tupifudasuzuzababex.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/96fb6bcbe4956fd714a554ed61a6b1df/94897909238.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888e418b983---18600532130.pdfIn PDF document text
    • http://webbuilders.com/files/file/xipelanol.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/mojisibibuxobi.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2149856b7---17302714331.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075ee47c1d7e---18689356451.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/60076559956.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-7-3/20210703155519570442.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/buzigomebesojekam.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/12209517754.pdfIn PDF document text
    • https://eucolait.eu/userfiles/files/12390576597.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b86124d76---86617766779.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/78767923422.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/1571123211.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608731ba7db69---58308987110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=dynamics+of+machines+book+pdf+downloadPDF 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_off0000e733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 11120 bytes
SHA-256: 8b18172d447a3288f75a5d2889c3f72920880cdb734fcfe45cdf4db3dc231319
font_02_sfnt_off000118e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E1 18596 bytes
SHA-256: f1564b802f7f94ef7312b3e6d37855fc38ea9c2a40173e0ed45a566252a8a7f4