Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1eab1c8d54e7875…

MALICIOUS

PDF

81.2 KB Created: 2021-08-16 10:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd022eacc04de30f15d8070b8718b7bb SHA-1: dbfbef58924ae27be4a2926f8f0506a12e133f24 SHA-256: d1eab1c8d54e78751966d84fc197e5e5abad2e88d3a973a24bc30d74c4cb773e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ba658ff2ceec3179771e3d4f3d762938/38346588970.pdf In PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/scdva70g08taa7g22cqqjlm406/jaliwizemobelikewobebaruw.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/70499502506.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/afmvn9p1ti3h1q46frb98fstl4/vajit.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/87758146177.pdfIn PDF document text
    • https://aneri12.eu/res/file/kolobasowimawoxek.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/rtainbq8ooclkd60p8m4bnqb9k/tuwutawagijej.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d8be8db90---xovosebupezikufebebu.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/949209be1e32afab20bd75194d350f7f/darokanoluvopixazofazur.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/56924ec12fcb88af15ddeafe3caa40d1/palepubaxiruxub.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/nujopuziwe.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/aisl369uomu7juhvdulgqa5oi1/90022888806.pdfIn PDF document text
    • http://belloverde.net/emailer/file/vomuxagisose.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/24926646673.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/sezasaf.pdfIn PDF document text
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/maxif.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883f7e50bde---90412944656.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947aa4e1499---binebaw.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/75139183800.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/vewelofarupitajolef.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/17e2979859b8508421ddd5f20a44df82/wozusomal.pdfIn PDF document text
    • http://annabarons.lv/files/files/gokemakamopolero.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/k62iu54mrvr2h49ht10vabjm63/bopemonewixujatus.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/aa39f0032688f29c5801ca76cd00b239/98752868305.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/86632023611.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/71376954186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=guia+de+comprension+lectora+septimo+a%C3%B1o+basicoPDF 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_off0000d398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD398 11160 bytes
SHA-256: 4316119423ef3fa099c08677c052921bbf5a3c9fe1661e609409a78fbc5edd61
font_01_sfnt_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 18116 bytes
SHA-256: d7782bd3133fb4e7663dc918cde219174957c2834b7a41466c80b3f3440a0ce2
font_02_sfnt_off00011ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1