Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd27b2e81386a9f9…

MALICIOUS

PDF

129.7 KB Created: 2021-07-20 18:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbdb73e8f62fc6992d6b8edd1490160f SHA-1: 9bfa3f728f4c93de03b17bf95cd694ffedcaa25b SHA-256: fd27b2e81386a9f9ea8af7bf58dd21543f934144cacb3ae32ce0b9ad1c42f08c
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to WordPress sites with form upload plugins, suggesting it's designed to lead users to malicious content or phishing pages. The presence of multiple distinct hosts and a link farm pattern indicates a deliberate effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9857

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 http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4idvccvjj81sj63ga4i4pan1h7/58637966431.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb909c3887---68362828505.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/1cr671500a9e4bk3h38clsbun2/zasawuxi.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160ab20f951db3---38246519842.pdf
    • http://anvlaw.com/userfiles/file/vivizimudewapes.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0f2e9f540---41722020379.pdf
    • http://engroupe.ca/aym_image/files/57413287076.pdf
    • https://hgb.se/filer/file/51283156233.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b34b20321---zinonoxusubolofasewebaxu.pdf
    • https://palcev.ru/userfiles/file/71839736413.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/5cf2064300d9da6c0f20365a77d0fbc9/97875347152.pdf
    • https://arch.ua/ckfinder/userfiles/files/sazifogetupo.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5b1ac339b---75314869576.pdf
    • http://spreewaldatelier.de/img/editor/file/sopidedoxumujusekij.pdf
    • https://noddy.nu/images/file/wumigovozo.pdf
    • https://sunnyvale.com/wysiwygfiles/file/36921467473.pdf
    • http://drprdesaihospital.com/uploads/57059921904.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a728abafb51---7929820766.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b113982337eb98ff487b26f030b9903b/bonajezajak.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f61869234---65726042018.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/pqmpvd7ploh1nruam7hppaosk4/66676658707.pdf
    • https://menlopark.com/wysiwygfiles/file/43221243694.pdf
    • http://gemculture.com/userfiles/file/pekinezejovanowadizo.pdf
    • http://screen.by/images/file/43323930666.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=leviathan+in+the+bible+job
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017b9e.bin
bfae6c574bb997309a306347107bc886ea65639ab402a92f8eddbf8b36157bf4
pdf-font-stream PDF embedded font (sfnt) at offset 0x17B9E 10232 bytes
font_01_sfnt_off00019275.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19275 16792 bytes
font_02_sfnt_off0001aa87.bin
53099574b62704bd6e680345c8295f11c4f8dabedb2f8ef0902b573fb66edc16
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA87 19924 bytes
font_03_sfnt_off0001dcb9.bin
fbec1ec5314a34c781a15bb91a88ae6b4391447c7095aad063f8de94a2aa2632
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DCB9 18040 bytes