Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe2e42d930ede69…

MALICIOUS

PDF

86.4 KB Created: 2021-09-11 12:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 304325644f5916dc3c4396f2cbb2984a SHA-1: b0209b429ff7dcd573783f404b82d3dd4ee1db9a SHA-256: 5fe2e42d930ede693f000debb93f63ee5757f6e16f5c9824fd3c895eb3eddd3f
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links to external websites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of a 'callback phishing phone lure' heuristic further supports a scam-like objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://burgas-remonti.com/userfiles/file/93724988839.pdf In PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/tibabaxikelavanodoxo.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/66903903723.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/zukijobasofamoterix.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/xawuzaboruwazopomo.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/33489192668.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109091304336248.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab3ef14c2---4375922016.pdfIn PDF document text
    • http://specimport.by/files/files/josumalukugivofokono.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613620d6de105---toxufolelalubabajaw.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/84262137943.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161390578cd5a2---kowezuzi.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/gopaniwegujikodotolabebop.pdfIn PDF document text
    • http://stroi-sistema.ru/img/gebepuworagevidovan.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131d9d65c631---simibepixikozefepowovetid.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/51614783650.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/nekogojuzulezinamuzegiw.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/56066246681.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/36156461148.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/zupakoxitumapurimejodo.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210903145650352087.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/51115169218.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fikinisonabasa.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/74359006967.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/6791b39a1efbeb00c9682ef61b9fd7d0/17397245762.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/87123367151.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210907075543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+phone+control+by+laucassPDF 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_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 10944 bytes
SHA-256: 652635f841ae95251df5637068e58d92436d50171a3839fb7631de6952a79bfd
font_01_sfnt_off00010520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10520 17764 bytes
SHA-256: 9424212d9f3a3fc0757fd0c4a85f544e54337d1379f883fcccf41918bf3d2f7b
font_02_sfnt_off00013360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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