Malicious PDF — malware analysis report

Static analysis result for SHA-256 83082210cec7c79c…

MALICIOUS

PDF

74.6 KB Created: 2021-08-08 23:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8f77efdc4957b0c63b1e0ae3e0af276a SHA-1: c228523de966131168e6f4cd913f6952c3620ecc SHA-256: 83082210cec7c79cba36f1afaefd8f42ea01b650d61ebf99d29cf5ea6d9065f7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. Heuristic firings like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' support this. The ML classifier and ClamAV detection ('Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0') strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160792e2e06e42---sejoriminamomidama.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/raraso.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998ea799a74---54835439068.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/20a42795929bebf70d5317da5a00997d/gemetujomef.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/mogixefezapekod.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/48sv1dsuovrkpc92e708aljnr0/veliwadorava.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726975e751e---xemabemebeja.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cda41a3db9a---15843064477.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b09793315---fuvojabagezaxokemat.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c7fc17a836231ecee46b965bf83cdd35/57377621851.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aaea80253---35088935159.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/sinunikafumig.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/34479e6e5efec98160303122b61b5edb/gukizapezotuveg.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/9a96ce68bc3a9567e9f480b7dc192dd4/rixixeburu.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/tebisokad.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/97lscerjbde12blnc9cpc4mai7/33816724705.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e6b7d6ce7---lefukow.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/rejazezebukazulisu.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/14096206109.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/ratuxuwegonajofigu.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608399e1c4cb0---voribafijibaxorumigaj.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/65158575553.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e484c9df5ea---57577681023.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/sopejobidigazu.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/xumovegukejira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=libro+derecho+internacional+p%C3%BAblico+carlos+arellano+garc%C3%ADa+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE88 16300 bytes
SHA-256: cc5cb8867716165b534220aa55b2e31cdf963b2777e00719c3711fbf8db024fe
font_01_sfnt_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 11172 bytes
SHA-256: 888a90db91172b484c0583694db266d523da1040771c880955bfd85223c52e98
font_02_sfnt_off00010119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1