Malicious PDF — malware analysis report

Static analysis result for SHA-256 422db24c28524cd1…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 23:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b7cec47fc500e18cbf858e0b95045913 SHA-1: b78c3bcbb2c177e73df659e1352b77f4895422c3 SHA-256: 422db24c28524cd14aefcb5f5b380fceac222dee352ebf31cd74a9ea7f27a010
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites, likely to lure users into downloading further malware or visiting phishing pages. The PDF structure and embedded links suggest an attempt to exploit user trust through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://m-co.de/wp-content/plugins/super-forms/uploads/php/files/hpd7riv466kpn3icgopsrlapnn/16211753951.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb80a51c36---fovesejus.pdfIn PDF document text
    • http://sparkpro.lv/content/file/belin.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/53587272836.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/sadiwiviropupu.pdfIn PDF document text
    • http://emannsltd.com/userfiles/refomarit.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738b475f57a---99087925844.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/totogesewabejuzipivelujas.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/pafof.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/f2b7bd17d7f3ae92d00c18da471d2904/xuzegafaxasi.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/56797165553.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c39e56869---17884847835.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/mavib.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/7437484474.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/24323530718.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/malazumakukivodaf.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/valfqglguam3gji40toeppgbjn/8889703406.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/fce95ece2998ad592cc0a6f03fd21904/83586962175.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/46d8d233b5d07922911874ea98432020/gatuvovutavufoxajam.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/vkk714ugk44us6g0vndjm02mav/fovopapof.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/8011948407.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ce53bc39edc---dimozojesoxegusesibolulox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=livre+tout+faire+soi+meme+pdfPDF 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_off0000db97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB97 10632 bytes
SHA-256: 73ca726146a8794776f6bcab7821b4bd3d1da7a8b097b02bc427f4ce21750425
font_01_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C14 20716 bytes
SHA-256: bdbcf6dc94c3a920e665ce39464acf7f517abba8381a7bae7133670deda1ee29

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