Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f13b506cd576312…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 05:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71373ac6b761e7d2ebcad79b29fadf49 SHA-1: 164509622704df60950975e338ad614e71efc5c2 SHA-256: 6f13b506cd576312c395055ed028fc076cc41f12f376ec5931031558d53af5c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, forming a link farm. These links likely lead to further malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=how+to+tell+if+someone+blocked+your+number+from+texting+android PDF link annotation
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad9407906---12985385099.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/35361076725.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d42d3469d75760ccefa9a5156f483c0b/lininajawalul.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/73073422007.pdfIn PDF document text
    • http://linza-market.ru/upload/files/dotimosesexonegufe.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/47502061003.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/13971161069.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/33366832744.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/45908686424.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/xagopodo.pdfIn PDF document text
    • http://naso10.com/userData/board/file/ninosudawiradafirazixibi.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/91029758612.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/nesof.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/a35358a30bc40fd95e3e0316dd3d4ea8/kefobo.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/degew.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/torive.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16138598b27803---madawavukesimarakapube.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/mamejanefomum.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/86443956474.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/81382592967.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/venof.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/21637565396.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/7q957ekt8dpfk0h2o23tlj02li/xazutufomaxurunojil.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16141d942108e6---63712930971.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/85974156377.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF25 11444 bytes
SHA-256: 87300799fb8c7e8b13d3141c6298fd2b8d62380236cb0ff121b4554affef5bb7
font_01_sfnt_off0000da06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA06 17332 bytes
SHA-256: a6d4ca40256c5f3b34b2512bc49a7cff4b3cfe177e0a6e8f9eb6b63cc7e051db
font_02_sfnt_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E82 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0

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