Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc74af339baa959…

MALICIOUS

PDF

76.7 KB Created: 2021-09-10 01:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 14b9ca98383372909817411ce9b85c62 SHA-1: 3c1e29908c1fbe0559fb0385a91ad7a5f1833d95 SHA-256: cdc74af339baa9596b9f8edbb476955ffca372e7dad934371906d47bffca83dc
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The presence of a URL with a 'utm_term' parameter suggests a potential phishing or spam campaign aimed at luring users to download content, possibly malware or unwanted applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://queure.ru/uplcv?utm_term=call+of+duty+mod+apk+mod+menu PDF link annotation
    • https://sakesushimn.com/userfiles/files/risulesujajoxutipa.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/2670c92aa91195890563fd2202c0ab0d/mejezejisimaresovemariv.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/12039453979.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/darutaramefusobesuzivaxex.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/wuxobetilanitejolijatose.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/20542769087.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/70162944032.pdfIn PDF document text
    • http://dongphat.net/upload/files/botaba.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/10f396bdd3be769393a44e4d5a7c867f/38687049769.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/19949960673.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/71975145134.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/f10cf2da7169c2310e908adb2f35335f/zenoti.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/80333210333.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/80841780514.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/30836202655.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/ritinezexazuxa.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/ganoja.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7ca2cce2c---tuzotijuseke.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323d886462a---56424985964.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/12095c62f6ba2aa6a1b040e722e602ef/xoxagazov.pdfIn PDF document text
    • https://airbays.com/userfiles/file/66015033963.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/38190065604.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16131af26678b6---toxigotuz.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/silofo.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a59ef66457---98981015930.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/pibuzuzefezezabi.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_off0000c8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E7 10636 bytes
SHA-256: 54347b87d177f31b600a55642a0cdb4c56e1865ceceb3129ff85889666140c66
font_01_sfnt_off0000e148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 16884 bytes
SHA-256: 6ea86dc385853c8b3d349a4d341eed7bb6998453373d69b1c29b26a0c6e2096c
font_02_sfnt_off00010d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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