Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f76bdb8ee0d9961…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 10:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 61da2efe8a55a0b1c7e9d726b6c73e49 SHA-1: 1c8dc032fad9a0126dc497c3281a33e09bc5ecdc SHA-256: 0f76bdb8ee0d9961d7abf7b0476b9ba1e1938265e9062f85b9bce9576c96d5e7
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities and delivering malicious content. Heuristics indicate the PDF is part of a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to obscure the true malicious destination. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's purpose is to trick users into calling a fraudulent phone number, consistent with callback phishing or tech support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • 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 http://pytextiles.com/userfiles/file/momejulatokufusek.pdf In PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/kijigepupoli.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/tifogabigejuku.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/xegaramopibumopedalu.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/davevupumidemokini.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/diwuwatanarapotipubizus.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-18/20210918104818251508.pdfIn PDF document text
    • http://safarang.com/basefile/files/tabezarumatasesozakedup.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/xowuxire.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/26795527150.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/dapowadinonubupuz.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/cfed6c336a49df9e403c7081f5d08310/81071210268.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/35593723971.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/11552526190.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/jelegamatitexofiko.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/73797994996.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfadccea61---kogedepozupijanegati.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/werawinupazabubodis.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/11713269567.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/fekodezolezusuvuli.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614526e2684c6---97416538434.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ce288d2fe---95770473703.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/81724494174.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613043554178e---zifadikariwakemibiwivut.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/28580093808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+can+i+create+an+email+account+on+my+phonePDF 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_off0000e25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 10764 bytes
SHA-256: c91710c3dee4b35dba6f251824eaee67f5d8f3002914660ee6c973582832e171
font_02_sfnt_off00011303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11303 17856 bytes
SHA-256: cda9de4fba0673a8307f353057797b6849ce23c647e156f1b55d82a5153113e2

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