Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc70d14796cb5f66…

MALICIOUS

PDF

85.9 KB Created: 2021-07-06 03:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d30410e9ea0ce689426cc06a34b2521a SHA-1: 1f562734c6dcc0a569184f25a965a9ba80b88ba9 SHA-256: bc70d14796cb5f665c45b1ab8434b6e904889357aceece7e3c72d1542177bb26
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious destinations. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/kmruf6nku656gapum9edo4guqe/79618956651.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098a85ceea7e---xaxalejutogog.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/1q8kctt9aj6kkt5tqu2ke7lbs5/58069127185.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d5faa440f2a---norunijude.pdf
    • https://ntct-dz.com/ckfinder/userfiles/files/gadapofakivad.pdf
    • https://medius.sk/userfiles/file/91831945413.pdf
    • http://jandenzobv.com/image_uploads/file/ruxevepove.pdf
    • http://pattarasawat.com/ckfinder/userfiles/files/sikosiweziwu.pdf
    • https://heritagecambodiatravel.com/userfiles/file/25480664237.pdf
    • http://enjoybowlramenandpoke.com/uploads/files/49211655929.pdf
    • http://www.kickcommerce.com/userfiles/file/47598781535.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738cce89e23---zunumewexuzuz.pdf
    • http://luatsuphutho.com/upload/ck/files/gimewatodimutezoz.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097181c10052---88509700398.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/cd434b9b89c5611c2894357f14cc0287/zemesadezosano.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb51e65611---96002831612.pdf
    • http://dimensionshoppe.com/alpha/ckfinder/userfiles/files/78689487230.pdf
    • https://abofahed.com/userfiles/file/dudire.pdf
    • http://elmbbq.com/uploads/files/2935031742.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca3a4af4e4---kixazawetezivizujodu.pdf
    • https://listapp.in/ci/userfiles/files/juwazu.pdf
    • https://mn-lawfirm.com/box/userfiles/file/6496514447.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/dokomozekiwewifavudariro.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1239bee2c8---5526060544.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34620cbcec---vuxejezomoxobuwidoruvakog.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/7g439jpkv1moqq54jmalpobl05/12339150934.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=tao+wireless+barcode+scanner+manual
    • 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_off0000ed5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 16792 bytes
font_01_sfnt_off00010575.bin
8464ca88f0e3125889388c3941ba073f57ba93b31e4113a3a9932e24e0492cfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 10720 bytes
font_02_sfnt_off00011e1d.bin
5911f888742ac21a89a9259e5e204bf487153832d0e944d934d458e6ebec391f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1D 16976 bytes