Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5475b9bc4b90005…

MALICIOUS

PDF

78.3 KB Created: 2021-09-04 16:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fee8d7850c220c32acc36e2294ba6bd7 SHA-1: aa5beecb2583ecac366d2018af276ca25a923583 SHA-256: b5475b9bc4b9000585ab1393dacf6ac600af81c69e6c5e00ee8b6e2282aa7e08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely intended to lure users into phishing scams or download further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests these links are part of a tactic to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://allytemp.ru/uplcv?utm_term=osteoporosis+disease+pdf PDF link annotation
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1e0f1f4b1---xirowonife.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/vabefetotubonuwu.pdfIn PDF document text
    • http://castanienfamily.com/clients/74558/File/46402098459.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b8086376454---6298308782.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0a7ea5956---tafirupamemov.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/nisinow.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/qjs77t6udpp6uuni36n625ojh3/gutagaxos.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/63442ac308c486832cd9c67f5ee7db89/tepobiwajubadugaxanisu.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160824aa0974b2---88624874806.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/bakex.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/depurafovulotofajimebusi.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16113b5215198d---xivezusunoroz.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/padegeno.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/poluruvagabegojowemum.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882e1f88abe---13646892904.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad469a2fa0a---51074470540.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/64478916149.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5a71e8e0c816dc3dddb173f945d6f2df/xozuwipovusit.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/pizowamiko.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/tuxunodonoriwuligeti.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/85810795140.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/8241156144.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/tanufametopobitazojaxel.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/174ef60fd7d7244b11b4ae207ac41c5e/nuwetubazixeluzabel.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/bakitajimesatikuzaronewe.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/3653d525937c1ed2e4844d8bdbd27bff/85498286008.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8261a6b009---lewanakikova.pdfIn PDF document text
    • 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_off0000d0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EA 10364 bytes
SHA-256: e7f9f2cee853edd3da2e1e2e1d97fd9e86d0aa48175e6c4a763652571415b7c7
font_01_sfnt_off0000e877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 16824 bytes
SHA-256: 61f9e26d381be5c439a74268bd892a976a2b9e5f7f78b7ab06b65125f8fe1507
font_02_sfnt_off00011397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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