Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b152993a8e9113…

MALICIOUS

PDF

88.4 KB Created: 2021-07-30 08:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d054e26ab9001d6cc9a37bdff98a7c6 SHA-1: 67ca7f91d346630614cded33b9fba66820d4a815 SHA-256: b1b152993a8e91137a142db6fc8916cfc3b6ff3997d0749c3f25ae54406e60a3
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://synerhu.ru/uplcv?utm_term=does+my+child+have+asperger%27s+checklist
    • http://sochistandart.com/ckfinder/userfiles/files/pofen.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a96f8bf020285734e9471fb181ca40fa/natapajozunesupel.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a3ccd5102---timisuvotitosutale.pdf
    • http://poexali.org/static/image/_u/system/files/nofowetifipak.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33a465dbe8---29073623892.pdf
    • http://legalinet.eu/userfiles/files/jufemekunozelib.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afda1fbb131---zapirakikowufafaru.pdf
    • https://fortworthdental.net/cmsCart/upload/file/82460369256.pdf
    • https://2acontractor.it/images/file/38044246255.pdf
    • http://kinel-hunter.ru/upfiles/file/nawimogusugim.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092ac908695f---japotenazotozetu.pdf
    • http://nhasachconggiao.com/luutru/files/47261030064.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f2b3e0024---66534250635.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/3b3886872991de7cdac9edf0aa42248a/leloro.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/e3bcd828393943856b06c009a168c7a9/rozumazopejego.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094600636d1e---8040871749.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/627d7e790a4637cb9e6fb0a34be3ef6f/xupibimuzosefujud.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d03e3b5c3b---povedix.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/hfcgqp2mfe202c7rdihc7r1472/dobowusi.pdf
    • http://bainihu.com/upfiles/editor/files/rajokefazif.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/52cd7ce885eeb40227a6dfd0da3237be/zupidafepuxatu.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/aa037537dcf88f42d6079a1340f9bc1c/29007014973.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609aeea3a2bd2---47216529880.pdf
    • https://brahmagnanam.org/fck_uploads/file/wezogopimo.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09a13adb9f.pdf
    • 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_off0000f44d.bin
060101c0c7d2c8f353d1c4391ed14a6d3818db994a15c5707ff0c1ca495d6c4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 11164 bytes
font_01_sfnt_off00010e49.bin
ad44f67ff36856bcbb3d250b6e0ee56cc85f9e5b46da1ae8ab7c4a3759cc8197		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E49 17096 bytes
font_02_sfnt_off00013ad2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD2 16792 bytes

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