Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa55301d83978e4e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 22:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bd18aa40197715da0ab0ed0a4835f1d8 SHA-1: 24119a7835850771417a4f4255ddb51b5194f856 SHA-256: fa55301d83978e4ee0775e12d845b9ae501469cf92406f2e1f0f13981effae5d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' directly support the link farm and compromised hosting findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://mk-sito.it/uploads/file/52427675223.pdf In PDF document text
    • http://sm300159.agchost.com/userfiles/files/12733811959.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/pefezibesevelalusapodibut.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/79986596099.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/poxevi.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/75972762942.pdfIn PDF document text
    • https://network-italia.it/file/77806677105.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/57520229282.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/kirawonesixavavo.pdfIn PDF document text
    • http://17njl.com/userfiles/files/musonara.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/voxuxob.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/tebamar.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/31489307287.pdfIn PDF document text
    • https://grandegroup.net/files/15853392595.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134a75c3e499---midisutozonus.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/gumomufisuz.pdfIn PDF document text
    • http://balalajka.nu/media/16958000302.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/jk7sqomg4mah17v38vspg1ptkp/97621454425.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8df88a8dec0b1e7d9a005ace1e843e4c/pufafapatimuv.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/84379592589.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/25093290999.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/55588301804.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109020917111646.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/61281602257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+see+pictures+on+instagram+without+accountPDF 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_off0000d69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 17828 bytes
SHA-256: da14c9f363edd363868d4a79dc3d4ebb2946b48da181f5e86ad63e0f32917266
font_02_sfnt_off00011d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D47 10952 bytes
SHA-256: d1dc207be655aa9e82e9a57a9a649b615af99257e8d122d86f04dd4581a20d0c

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