Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac1951bfcbba8fc…

MALICIOUS

PDF

78.5 KB Created: 2021-07-01 23:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 526e0dcdc456424034fe2b3911fd5f7c SHA-1: 0b1a1046769ccaec31667b482305709fd4bb846f SHA-256: 6ac1951bfcbba8fcec5cb01f9de455766cfc2e463fc0b1c463523cfba3aa4b13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs that point to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a47918b8f86---59607246907.pdf
    • http://szao-spb.ru/images/news/file/12470450999.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/rh5t9rfmipis3obpv64ttm30r3/91535010518.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/qk9f07qfmev16d6c1s8nc5mnlh/norodofesumabunolo.pdf
    • https://alshamiltrading.com/alshamilfiles/file/xapasubimow.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cf4030577---negelemiditaligaz.pdf
    • https://beautyyaurient.com/editor_upload/file/23817542875.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160759dd530a29---ponixolemopap.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82d37fc6b---31372529094.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/70821820403.pdf
    • https://momsgardenfoods.com/ckfinder/userfiles/files/gisupuwasubipafikuba.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/snoe0nm91ce2t5a596u4bv25d0/48029097617.pdf
    • http://www.siposferenc.hu/html/xopafejumuragazutuga.pdf
    • https://vgi-vn.vn/app/webroot/img/files/80116572078.pdf
    • http://tsg-edinstvo.ru/userfiles/file/39726973668.pdf
    • https://actor-conseil.com/files/file/soxoxekajuvavabet.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4ade2805f---14539247169.pdf
    • http://technocom.pl/editor/file/86541084314.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/67atcl0uiv91von9arpikdsebo/sizubuwisodapujobezov.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075691b19245---93014105502.pdf
    • https://thaiahpa.com/flash/files/82004321977.pdf
    • http://jhferry.com/data/fckeditor/file///rebuvelul.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8d78b6cf---73484365770.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/senon2af6j0g49ugl6ubf40522/wagokuwez.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=welcome+message+for+parents
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce29.bin
f6163d7ba7b83c28cf0b74e14ee0f38fe53f0adc7919c8d3b802833d0c703374
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE29 17504 bytes
font_01_sfnt_off0000fbe2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 16792 bytes
font_02_sfnt_off000113f9.bin
3ff4f269578c96ca8a22a1ba219072ab32b10b47bae86d64573b7a42b463dd90
pdf-font-stream PDF embedded font (sfnt) at offset 0x113F9 10724 bytes