Malicious PDF — malware analysis report

Static analysis result for SHA-256 3485664ca46dc6b3…

MALICIOUS

PDF

83.3 KB Created: 2021-07-02 02:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8409fb49be59a4fe4549b755b400061 SHA-1: c35493d267beef5ffe0901858c35ee664ea9504b SHA-256: 3485664ca46dc6b3cef435cdae013ce68dcda94fab61476a34bab9b0a6b5bc80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content. The embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to malicious sites for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/da4d802adf081f9ff451666adbbaba9e/kivazopanubopefepiripebak.pdf
    • http://saothienemb.com/uploads/images/files/vezajasazepozemuzavak.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e1239d73992436bb357a0c83860a3aad/fubavitozetelago.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/fd5398405a5476222d0de0298ec33e5c/tibexuku.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608040927ef8c---rowarivemapumogokoseneme.pdf
    • http://pelesiuvalymas.lt/i/File/wolijivapeb.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/1a9ba6f34d41234f81c2b4b059efc6d3/vekinilapuwodigu.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abdf879e774---liligafotiw.pdf
    • http://studiovalentini.eu/userfiles/files/vaxomuwofuzusavozotijek.pdf
    • http://kfbi.ru/content/file/rozixowum.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c580710d3---majumidedugedu.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b89858d39---85456521116.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/dcf7b86172a739bd4eebac1d377f16c4/12093183247.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0134fabc4fb855ea815fb74b4c63c0ac/letinebigoxuzepusonub.pdf
    • http://richmediahouse.com/admin/uploads/file/38005947522.pdf
    • http://itkaufmann.com/images/fckimages/file/girebezoxufipus.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079741cc3dc3---19601733215.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609797cf24894---19357647091.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b893b18cf---97633507697.pdf
    • http://ehomeforeclosure.org/images/file/3364896190.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/7372b07cd6c67130b3988c81d9044483/setubipex.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/1m8fpgcikm6hjd9t3si28ksqs7/bozokufojufobajo.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/157eb27c51a20016a8b9796e7366e267/68636697895.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=song+for+gameplay+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e427.bin
b39ea80e92f4b540f40f300c7c229ae5df3223420afc38209fc9c834131968d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 10760 bytes
font_01_sfnt_off0000fcc9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 16792 bytes
font_02_sfnt_off000114db.bin
3b4ad7832527806cc4d73183c18b295576ff9eaec77c333f8723feb10477d40f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114DB 16572 bytes

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