Malicious PDF — malware analysis report

Static analysis result for SHA-256 909604dc4c854ac4…

MALICIOUS

PDF

84.2 KB Created: 2021-08-21 07:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 380cccab9196442224d0571b73dbed6b SHA-1: 8f26aa63469273760cf172e132a2dc247fe34e8e SHA-256: 909604dc4c854ac4e0eccd466da07a1fe004e86fa583f00b692a80648ee189e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm characteristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://smidgel.ru/uplcv?utm_term=mine+runner+game+online PDF link annotation
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/7c85c0f0cc0f0242afc9d36b302b30b7/58195033216.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/51492027716.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/92ccdbae59a5828acd483c7b02258e1d/lebazekomeg.pdfIn PDF document text
    • http://imaginove.eu/data/Files/61297200499.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/29869682632.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/muwajifakenozezepawepelaz.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/52087e62fc7b232d3df655d4992f2549/mosopugi.pdfIn PDF document text
    • http://nakatka.com/files/file/bodijosufira.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609084387cd1d---16507998886.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856f0e90063---37986451178.pdfIn PDF document text
    • http://fxmeat.com/upload/file/2672ee4f5241a3452a8ea28e3c4f9598.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608341927a509---betetutinujivuwekepadek.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/lapokezurabupebafuwapura.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/20749501785.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085bc5468ec0---36011922965.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba90fe6f86b---95199493066.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/23891712849.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fc5e9f69---35786129261.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/42ra6u4ng00odracadj9oeisi7/xefowofesaduvem.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/50576231145.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/zalop.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082236468f36---52350819760.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077a627f22b3---vakalabexaguruli.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7e42d4be1---nunegutasijilotuzaxezenez.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/10985044788.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_off0000e6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C8 16928 bytes
SHA-256: 85285138437d6d2b0f7390f2e3a3eff66590f064ab72dd17a377e51a5842af5c
font_01_sfnt_off00011317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2E 10276 bytes
SHA-256: 968c367fcb189d581da545d3c48bbdeb60994d4840c1b3c65f258b6fa11dd75e

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