Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb866a1cbc46c1fe…

MALICIOUS

PDF

72.8 KB Created: 2021-09-09 17:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef563ed46648a19bcee6bd30f0a6c5cd SHA-1: 77a0efa04bb053d3330f2f07dea78a5e08ac4f8f SHA-256: cb866a1cbc46c1fe4e56769090fe607549874f63351adc1af8b6fd3aa7950444
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech-support scam. The presence of numerous external URIs, including links to compromised CMS upload storage and disposable hosting, suggests an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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.
  • 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://queure.ru/uplcv?utm_term=vidmate+app+song+download+karne+wala PDF link annotation
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/degokurerupo.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/tqujrmjchfgu4u7pugij9n8vi1/99092021603.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/nijewiza.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1jt5pipra9ciahg4gotmevus01/766130538.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/51967664692.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333684a951f---murimikofozulusat.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/voponenaxujofikoxosega.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/27921611355.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/egcfh7ucomlhd3sblqh09vjtv4/tozaxebirujoxi.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/nezaz.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/87941397501.pdfIn PDF document text
    • https://onwater.my/uploads/file/86958868657.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130882d1ac21---wunagizakuk.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/widom.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/93952597641.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/79779943427.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/lesazifeluwonaxake.pdfIn PDF document text
    • https://shinaltd.ru/images/file/1649536013.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/1544233956.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/12449411313.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/vesibutejuvuguwuguxev.pdfIn PDF document text
    • https://10fci.org/userfiles/file/xumabopojugegofogewazimi.pdfIn PDF document text
    • http://keitbg.com/images/files/73177121288.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/jenatugunapubepamaridub.pdfIn PDF document text
    • 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_off0000b95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD171 10884 bytes
SHA-256: 104e75f1653cab5d8ed0404132a50f532d624b672f9c78a5ad1586dc3e787d65
font_02_sfnt_off0000ea67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 16884 bytes
SHA-256: 1039a583282cdf48752c1a9f402f2da780456bbd1c8c9598c51b8ca3a7ad5dc2

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