Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07b28a0e09db6ab…

MALICIOUS

PDF

88.5 KB Created: 2021-07-03 10:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26be2371fe09deda996cbc015f0e026d SHA-1: 06411ebbf93d47fd686340d51a68fbafd5709a31 SHA-256: d07b28a0e09db6ab8b17a11ce4705a62c3f57013cf362e5733a3c78a3fe8af2c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs, despite some being marked benign, contribute to the overall malicious intent of directing users to potentially harmful content.

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 https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c65175b7fe---74007885366.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2f25d8eb5---67262880083.pdf
    • http://autowassenindex.nl/images/uploads/42342368796.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16078f4248cc3f---89567353787.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/e276c6f44cd0907e2d1bd580caa7c9bb/kegifusezufapa.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3b5c9faf---pugepapaluvam.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/5ddf6a29429c985f65db0f8ea444da69/fuwujivili.pdf
    • http://onlineexpert.in/userfiles/file/lekulibar.pdf
    • http://phpirateboosters.com/clients/867602/File/24609492869.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/82935478163.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98c4a14d9---serosibunup.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/00r36fl4ni05eo46pqav8uheu1/6185286185.pdf
    • https://allcreaturesinc.com/files/files/rowabawuju.pdf
    • http://jp-photo.cz/soubory/files/mawuxatotodiwogesenori.pdf
    • http://psychoterapia-przemysl.net/img/userfiles/file/dizovulimijopuxorodazo.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9c7051895---volomebakaxikekenus.pdf
    • https://cowichanmusicfestival.com/userfiles/file/dalomabanobazowumegowase.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606c835b0e3fb---22913115405.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/16791969966.pdf
    • https://xo-sound.ru/userfiles/file/ferolevuzunaberum.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16075021349d8a---31418032039.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc83dd704a---gekuvi.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a01367423a5---zebezejelawobakalota.pdf
    • http://chithanhplastics.com/uploads/userfiles/file/98585734238.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=when+will+earned+income+taxes+be+released+2020
    • 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_off0000f5ba.bin
cf8a4d808812b2d87336a7372ec3813c36aad98ff720a0ac41242d559d121e75
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 17000 bytes
font_01_sfnt_off0001221f.bin
7a447701a361aed1040d84b23777ee8edebcfd5fd6b0d1a818d2b549066a6772
pdf-font-stream PDF embedded font (sfnt) at offset 0x1221F 11196 bytes
font_02_sfnt_off00013c3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3A 16792 bytes