Malicious PDF — malware analysis report

Static analysis result for SHA-256 0afc0c7e6a74ee06…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 17:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2f725a7fd64b6fa33dbde42a17871425 SHA-1: 3e0c896125665070a1d21c6d204cdba6d94634dc SHA-256: 0afc0c7e6a74ee068fe8332c5c6361002dab3f27a91d39eea628bf46a94263e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The primary attack pattern involves luring users through these links, potentially leading to phishing or the download of further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://crewmak.ru/uplcv?utm_term=how+to+save+multiple+pdf+files+into+one+mac PDF link annotation
    • http://zulassung4you.de/bilder/file/26932508379.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/xuxatowusi.pdfIn PDF document text
    • http://sixtyguildersresearch.com/admin/photos/file/zebabip.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a20a1f5b810---megedadomidinakev.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/214ba48e3e3142f37e0ddf2b1e4e8470/mufulovukipodus.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/80728535211.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/rizosutebalamavufozedifup.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/42929562431.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/1984635149.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/mpd4jdqhjiqu2odhd18hc5m5pl/18738759332.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210705_385280FD0C6B0AF8.pdfIn PDF document text
    • http://bakoca.hu/files/file/47751474229.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a915f79e85e---tifotab.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088bc65b4067---740831436.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/katasusutitixijavaku.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/rurawa.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/zirasemajeze.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/11929363377.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/pipes.pdfIn PDF document text
    • http://vhktn.at/images/content/files/49188834407.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_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 17848 bytes
SHA-256: 14249daee90caa7c19b0966efc771535d37d10bcbd9538aed3694d3b2d71bd55
font_01_sfnt_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001221c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221C 10924 bytes
SHA-256: 41296d942621bef4424daa6cb9341f8fdcf279d82eeab435468116e3e86139fd