Malicious PDF — malware analysis report

Static analysis result for SHA-256 5627882cbd24e4b7…

MALICIOUS

PDF

75.7 KB Created: 2021-06-27 21:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f24d3d39b9c2695430c382dc590867dd SHA-1: 8e53d6220ee84f2f8e394943a2b3d90cfff398d4 SHA-256: 5627882cbd24e4b74c6e6b049de65396a06371c547c3346f2bee98ea6f5d0b35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608483360a61e---27126184817.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a77f575505---vojom.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/kb3mde9scb5f129de914lb8gn3/jesipiwuxox.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608bccdc35892---77023805873.pdf
    • http://2ds-creations.fr/userfiles/file/zosaxanusasuvedofusep.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b85e8a9abb2---25541233832.pdf
    • http://tort-art.ru/userfiles/file/zusasitatiwofinobune.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/811a41f3d7b9209a1c36d2575765f076/1967237467.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607717eab2833---joradobowakiropuvelorasu.pdf
    • https://samngaimarble.com/html_upload/file/59048030472.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a64786d1357---pegapiwixe.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/1691958173f7aef8fd07b30831553ed6/kikuwuvasebujizowezumo.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3792e25a6---28582834380.pdf
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/funasutekemokobejutuf.pdf
    • http://abwvictory.com/uploads/files/lusawoliponepe.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d34fb6c9a61---sitabopifiwugevori.pdf
    • https://okud-istra.hr/userfiles/file/86368078215.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/a66991d780bc6fbc58028c25b71dc49d/83754499611.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/p7i43hrdec5kocptse490vdo4v/lenarusixetubufufub.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb3e01c3bc---nexemowibus.pdf
    • http://vds-construct.pl/userfiles/file/76873232608.pdf
    • http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/gabosuwejejazininetitab.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/76b832699c7995854a4d7f293d54a375/wurudeniporuzov.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ss9oajmira99nf10m0l4ij8124/66414907830.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a2d30285f---85677074472.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=bobby+caldwell+what+i+do+for+love
    • 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_off0000c600.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC600 16792 bytes
font_01_sfnt_off0000de17.bin
4ba7e54e20e52768ab0270037bd3683c83d096336b31eceeff6a0558e08c6f8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE17 10760 bytes
font_02_sfnt_off0000f716.bin
55a630dd83d6004b6890c9dae4ba11140c7169d4d1bf5af774bd48adfcb8294e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF716 16768 bytes