Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1cbc6007090dae8…

MALICIOUS

PDF

82.7 KB Created: 2021-09-21 20:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cebf85f6f21717a401daffee9422d896 SHA-1: dd971548cd4f23fd55d1286fe69b1afede15f510 SHA-256: f1cbc6007090dae80d1ee9b8fa0cfb905a9867e4fe01b281bdc952e55d59df9c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicative of a link farm. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution via these links. The presence of embedded JavaScript suggests potential for further exploitation beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=all+apologies+acoustic+tab PDF link annotation
    • https://guineaservicesproviders.com/gsp/files/kaxel.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/sesawul.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/51002684358.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/51203682977.pdfIn PDF document text
    • http://torgoborud.org/images/file/regoguzewikuvowi.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/47142560890.pdfIn PDF document text
    • https://dptech.vn/uploads/files/30745725529.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/jopejapalemikezabefarej.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/42676116234.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/28107173156.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/182236409864.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/rofuvuxisifadunex.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133414e57a91---2304135208.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613064fea4a90---nowoxafabuguwawije.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210911_41BD2D33F1AC182D.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/burat.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/d9ac42566d90295473ee1e2ebec3bc10/kokinorokilut.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/35388907080.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/96790109735.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/57478928110.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/vetamodabajon.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/23137366751.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/vabisugi.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/tuvuweropokutonereto.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_off0000e03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03A 17392 bytes
SHA-256: ce043e07a0bea655d6cb9c2cc092d953d972e6ba535ad9342ed79996dd1fac3a
font_01_sfnt_off00010da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 10564 bytes
SHA-256: cc7125f004ad6f1648d31c70c5db9dd21486cc52e1b9de515ffecf8afef21d1d
font_02_sfnt_off000125ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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