Malicious PDF — malware analysis report

Static analysis result for SHA-256 584f6c6e125ed9ec…

MALICIOUS

PDF

87.6 KB Created: 2021-07-17 07:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7f844b742025f4f5cccf58e919095ac5 SHA-1: d66ebfb2956c70b3f21ad3444c847c23a6fdb097 SHA-256: 584f6c6e125ed9eca71cb6fdb5fc78e153c8d6ebf63663e2f48a38b3affe35da
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malicious intent. The presence of multiple compromised CMS upload links and disposable hosting further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/83bcae7b4c39c2e66e195e8fb4b90125/26517259682.pdf In PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f169b71803---67508105964.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/bomadasaselixagezalevok.pdfIn PDF document text
    • http://aimic.com/userfiles/file/46175020200.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/nedozatukenajul.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/4898977848.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/samuraxabedezopidi.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f89f20ef53---totux.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf49b3b7e13---garuxuxofugozis.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160da2d253a9e2---rumisome.pdfIn PDF document text
    • https://facades-metal.ch/ckfinder/userfiles/files/zazinatusasutodifaxamaw.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e20a8140731---kevijogesapowogu.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/39cdb933c05e5b6558dfcd5d7312dbef/wibetegazap.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc16555664---tifuponafasiluxuwojasib.pdfIn PDF document text
    • http://prestopc.it/upload/file/lelejaselep.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/52168408129.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/d418d6b32a089279915710cf434ae0f8/lajiv.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/fd6aad2d2315de8b8cdbddfe654e7243/torojeguzupelejalevutam.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/42978388812.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160801085a0a4a---gudolafanekuxununoruko.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/68943634125.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/ccbd85032e0b21a11697afe3eecdfafb/6608483594.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/45369065193.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc3ef558d1---jubeworapisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=perimeter+of+square+questions+for+class+5PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4F 10880 bytes
SHA-256: 150d2130a85eb226dae945e163affb0669f351d563e55c729ec9b03e043a5685
font_01_sfnt_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D98 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_03_sfnt_off00012313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12313 17368 bytes
SHA-256: c008db6e635664166b17c4578a7659f323559e8af9961af39707fcfcbef6375a

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