Malicious PDF — malware analysis report

Static analysis result for SHA-256 56620803a79921e3…

MALICIOUS

PDF

75.5 KB Created: 2021-07-05 00:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 097feb1bb6edf99597d00fc6b7f9b243 SHA-1: 453f4e1d5af501095fe1aaff32183bd7aaf8684b SHA-256: 56620803a79921e3a5774c5a117de0283d441d54d95ffade6c643d0f08df907b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thuexedanang247.com/uploads/image/files/sirabibajexisudub.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091b5b12a0ce---27047618023.pdf
    • https://ovalpolycoats.com/media/nuwozinifebeviz.pdf
    • http://jkmdc.com/aversystem.com/userfiles/file/99623557248.pdf
    • https://pharma-tools.eu/galeria/file/68470627301.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/bd482c70f3a38400cafda1203813e7d7/ditarikeguzoj.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a2f949b4481---32922637427.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16078b990ca686---pelimifotikinigitulogado.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/2cad0d6d64dfebc3182f6265e93c86d1/toruxovobunuximizutidiwaw.pdf
    • http://moristas.com/userfiles/files/35661322133.pdf
    • https://office-agglo-larochelle.fr/userfiles/file/mafisazinigisewitasis.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607290fa2b2c8---32392415724.pdf
    • http://gramercygrand.ru/files/file/buzubujojam.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/022be8ec811ab158210fd0a53ea2babd/15959789716.pdf
    • http://igigeothermal.jp/userfiles/file/pofomukew.pdf
    • https://reaga.net/js/ckfinder/userfiles/files/fegawigosanuv.pdf
    • http://vizugy.hu/uploads/files/delabakovinagonevison.pdf
    • http://minerva-collection.net/files/files/sezonededuvowusovoxizi.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a111cdf9a2a40a12e9921ca9ef1a5b54/nokurujevigasami.pdf
    • https://monyetjoget.com/contents//files/93906556080.pdf
    • http://fouladsazanco.com/Upload/file/rixolebebisum.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=types+of+gas+fuel
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c74d.bin
ed46b98c3c1d2be46571316c14bb77bb33272865a152ba37992913c6ffd63c54
pdf-font-stream PDF embedded font (sfnt) at offset 0xC74D 10316 bytes
font_01_sfnt_off0000dec2.bin
da73c690c328952d504c9b7bb8daff0a9aaf8041d85995aaed70c137f2455aaa
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC2 16520 bytes
font_02_sfnt_off00010938.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 16792 bytes