Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a688a3ad41cc95c…

MALICIOUS

PDF

93.4 KB Created: 2021-08-08 13:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ca56312881021783f88297b2c06a7de SHA-1: 96931eef9af7c2cc3225fd685ee6aa33b423070e SHA-256: 4a688a3ad41cc95cbeca71460e5d891d3194107514df01d806c2062155c289fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, embedding numerous URLs that point to compromised websites or potentially malicious content. The presence of external URIs and link farms suggests an attempt to redirect users to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://krisoc.ru/uplcv?utm_term=maneuvering+the+middle+llc+2017+angle+relationships+quick+check+answer+key PDF link annotation
    • http://www.heksan.com.pl/file/nuzarosit.pdfIn PDF document text
    • http://perfecthospitals.com/ckfinder/userfiles/files/kejopepixojetorigeli.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1f1bb2535---5533156865.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/ad2a203e97eda3aca55aedf5947da98a/rawoseleforiwefona.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/dadirixovabuna.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a1bcc98accebd4e644c94bbf46a9ee7a/mizotizategegiwomu.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/1ea1a4bf5896751897d42942861878c3/53977747285.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/kixefiguponorinuga.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085096598318---vozezamadosapotikutu.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/a8650ee1c5842541af31930225d08717/41399604285.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf40b56ac9---33635389252.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fe3919f58---gegav.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/79888026369.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/tizex.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/80862126379.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/41419483407.pdfIn PDF document text
    • http://dongsachhanoi.com/webroot/img/files/36688295758.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/83450511295.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/matuzobanuzogofabikewow.pdfIn PDF document text
    • https://bloomeng.com/uploads/fodugo.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/72338052262.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/gc7jgome2hsv8fhupfv9frhdjm/lajaxada.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/25663510047.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_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 18660 bytes
SHA-256: f5027401753aac6adf15e27318180fc3118e176fba9c43a82a6b409287ce0958
font_01_sfnt_off000132e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF9 11904 bytes
SHA-256: e8f01d0bbc01a4599ace70eab4351373672e7651f33489a825baa9f819c0e3f9

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