Malicious PDF — malware analysis report

Static analysis result for SHA-256 08615040a1c255ab…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 14:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f236a6b4524a912cdb8c15c744680fe7 SHA-1: b39e44a5beb4b52605795960d723e7d6017f59cb SHA-256: 08615040a1c255ab9edb5a4e027fbe50c1294acc324208f601e6bd65b59bfe59
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://philabc.ru/uplcv?utm_term=android+answer+call PDF link annotation
    • https://ckmandarin.com/uploads/76382468640.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/gibapanavalezunaxa.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/waboza.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b98afbc622de8f9589a167073c7a124d/19621696117.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614625ee82405---mesizurawelu.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109050608243700.pdfIn PDF document text
    • http://huefpdf.org/upload/file/robefupew.pdfIn PDF document text
    • http://hotechike.com/files/files/14436472249.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/33016305193.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/j5rjaibf7rr6ifaqgatpg7e6n2/86155395915.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d943f36ae---56230471408.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/54462078361.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/75736676290.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/90614325560.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/gifojuderezajowekenajubok.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/27201754329.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/9109896893.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/lujemupogarizubewu.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/36799181694.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/viwewafobuj.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/munufamepifejuvibifadokow.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_off0000d852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD852 10332 bytes
SHA-256: 2478f56637fac46198e4bdafa901c2882dfa0f4677fcf1e4c1ff7a9c870082f6
font_01_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 17916 bytes
SHA-256: 9a06611308192052a66f6e13c714371a873d6666a68a2eaaa06feb00189d1a33
font_02_sfnt_off00011e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1