Malicious PDF — malware analysis report

Static analysis result for SHA-256 020d4a289b54370d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-15 10:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c849ca365072debb3000862b5178e9b5 SHA-1: 57f5dc4a93643245fc4d1d21a1769cbb68478fcf SHA-256: 020d4a289b54370da4e91f56d06ef6ac3cb9d740828e8bc5ce69220ed6e362a0
164 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=movies+wood+tamil+download
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/oefqil12216oclbiq60spped0c/jesifasanoz.pdf
    • http://scuderieverdina.it/scuderia/userfiles/file/dujukuzidojowobi.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/v9767i3dfujbcq46stskn80413/wemej.pdf
    • https://castilloexterior.es/ckfinder/userfiles/files/siweverewesof.pdf
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/6207874615.pdf
    • http://haitrungkim.vn/uploads/userfiles/file/zikonotazitilexagujufiwo.pdf
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/42055067159.pdf
    • https://olamare.com/img/uploaded/file/zuleloxefa.pdf
    • https://tttinox.com/upload/userfiles/files/bakokitedijozexarana.pdf
    • https://irepairplus.nl/app/webroot/files/userfiles/files/sixunafemoxabosije.pdf
    • http://oralrem.kz/ckfinder/userfiles/files/mapivubotifotefivojaxese.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b382e0ab84---sawuxoxuleni.pdf
    • http://aorganboys.handyfriendship.com/upload/files/sezulavasakudegex.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/19453510496136809812dad.pdf
    • https://daaeportrett.no/upload/file/nawedobaxemupifebo.pdf
    • http://dezmaster.com/userfiles/file/garafakixolamimefirono.pdf
    • http://studiodugnani.it/userfiles/files/7532076940.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141692a5c66d---joxozomusidenevur.pdf
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/kegadakemosuxubi.pdf
    • https://mayphotocopydogia.com/upload/files/pojujoropegugunopen.pdf
    • https://cuatudongnhatrang.com/uploads/files/menizikakiwomovezefozadi.pdf
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/36485991846.pdf
    • 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_off0000df91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF91 16792 bytes
font_01_sfnt_off0000f7a8.bin
e5e154e1beadbaa5b6d85c43b2425e17c55eae234bb39094807bf1b6443cabf4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 10452 bytes
font_02_sfnt_off00010f71.bin
607d36253527e3e49a420871c31e672d2ec1c3a79de0f0520133fdfd70bde09e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F71 17692 bytes