Malicious PDF — malware analysis report

Static analysis result for SHA-256 3565923a85f91eab…

MALICIOUS

PDF

78.6 KB Created: 2021-08-03 16:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 87a1548f8228555932edfafb602ff8c7 SHA-1: 277900b46a182a7cb12cda61e5b260cc5a81c750 SHA-256: 3565923a85f91eab7eec02fad4beedb576392b5ac7f2632b8c0893c05d01c891
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://smithandfriendsfamilyreunion.com/clients/d/d0/d05d9bb0b75700e7199fc64e52c62161/File/zekuwe.pdf In PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/36562034769.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/u8t8ebipqdfe4c22nmahkkvda9/29762216868.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/towafolojabenubejeluxuwi.pdfIn PDF document text
    • http://kme-kme.cz/files/file/ririrati.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/xadixuwirokexubajisobam.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/81016197708.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878d5b5e374---7966992823.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/ad71a8444b4d636ab1313ac1623ae901/53104338683.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/katowoxozebuzokutazo.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f911535e68b19830d913db31d913213b/juniguzexamofupipame.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/5331926812.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/gagoxamamiw.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe1d8824a0---riweruxamow.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/taletukeji.pdfIn PDF document text
    • http://kbchina.de/upload/54809239794.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/1c7b51a43f86f440cb410c7f28333042/kewatajegutilulad.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/7614215623.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be618c482c0---52269781280.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607989c0cd5fe---67266195239.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/hv9n3pnp6epi3vm717vffe7kk7/34539700238.pdfIn PDF document text
    • http://someteme.com/archivos/_20210628210956.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d3c8ad39632965f8b9dbc3b9e5db08b/vazexasofaxowojasox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=geometria+y+trigonometria+baldor+pdf+gratisPDF 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_off0000cede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDE 17228 bytes
SHA-256: fe5d2e5011df8e93a230cadfe40ef154a08037c9cecbea844aa44b57ae02853e
font_01_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11247 11132 bytes
SHA-256: 931f2e36d5ed08063af8b548d50ccce56a1b07731ff20da4cffc42328a070c38