Malicious PDF — malware analysis report

Static analysis result for SHA-256 c105e2d521f44cf8…

MALICIOUS

PDF

83.2 KB Created: 2021-10-13 01:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8f5e38ddee240771faa52d969e618f5a SHA-1: 9592aae91369086d2933da65439c16cbf6ef3e5f SHA-256: c105e2d521f44cf8e36ca875cc9551eb2e0d862126d2084c61ec0b7104f6cf02
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The primary goal appears to be redirecting users to external sites, likely for phishing or malware distribution.

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 https://tlkingatlan.hu/kepek/other/file/67038085315.pdf In PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/30250367601.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/11002551421.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/minepot.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/27a89ba967bde9b545828ea75abd82c2/fumalib.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/moborewigafisunekigile.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/89303690970.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/devegasalebuwufeb.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/wikivenaguz.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/ginupibubuvomesuka.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d12618b16---kimipaluti.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/durikirotinotigadub.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/jesemobifikazilureseve.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/87841681446.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/kelopejunererekuba.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/83073704648.pdfIn PDF document text
    • https://www.confirmedtour.com/files/xusuz.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/vamerokuxoxararu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334bcb7ce81---75645088720.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/rozupibupugovifodetimike.pdfIn PDF document text
    • http://ausafe.net/images/art/files/16085704533.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a9055ac03---tilukumixozeroxoribezori.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/gupekasami.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/93671721626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/7xhmvLXWVJc/uplcv?utm_term=tiger+tales+2+photocopiable+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_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 11016 bytes
SHA-256: 94e31e749185b5319e5a65cdacba03d124bb0653068c1e3f627cf449dc695778
font_02_sfnt_off00010af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF8 20240 bytes
SHA-256: 8e55c0d26a0bf963e969474eaba2731cd092265858f8d68c0aa638edda5f633b

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