Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f4586f9dacfcbb…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 00:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ecbbdfe3198b83a8e4df12837099086 SHA-1: 100cd5ddf209936350ad2830ee989776e4dbf898 SHA-256: c5f4586f9dacfcbbd4555bef29fcd5fc423fe1856ff992a78e4ea82e6df54ee0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable domains, likely intended to trick users into downloading further malicious content. The presence of external URIs and a link farm structure strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=lit+match+premium+apk PDF link annotation
    • http://giadinhmedia.com/uploads/files/2133950973.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/f74076df9abe3cd833383314843a91fb/toboxenoparanumufam.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141629f89d56---98595508916.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/83143704673.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/gawefozepaw.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/sebigiluwuxarudagepokegu.pdfIn PDF document text
    • https://steammining.com/userfiles/file/31112589925.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/ditefomifatel.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/71302231257.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/xotukufekutevifi.pdfIn PDF document text
    • https://greenways.at/userfiles/file/faxofugorizezifurasez.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/lvao3tqv9m6b4fpo26hntd97su/xozimi.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/pexuvir.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/93934884868.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/33903290773.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/zitofa.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/45486741776.pdfIn PDF document text
    • http://simonide.org/userfiles/file/67108892407.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/14007621509.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/26757870773.pdfIn PDF document text
    • https://computerzone.pk/file/betekowat.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/37926107833.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/tobolitekuwexodog.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_off0000dc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 10352 bytes
SHA-256: fb12e9430e35bd014aa9c36dbf887ff5d6b7becb6817ae8fac12bc83b7d80052
font_02_sfnt_off00010bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 17692 bytes
SHA-256: afdacd1c955d44802810866a57a154c8355c4b256fb7500807009ce3609fd9fb

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