Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8465667953a853…

MALICIOUS

PDF

77.7 KB Created: 2021-09-11 23:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 50e7d5da56ac8ee66ecaa0d433cfacd2 SHA-1: 23c75b543e27b77c38f6408c62bb38428af2abcf SHA-256: 3b8465667953a853adb6241befde4f23c4205e116dd1ad4be53e1e57b955584c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm for phishing or malware distribution. The 'SE_CALLBACK_LURE' heuristic indicates the document prompts the user to call a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and numerous external URLs points towards a malicious document designed for user interaction and potential redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=speed+post+kalyan PDF link annotation
    • http://de.ruben.pl/ckfinder/userfiles/files/pizozazuwuzonilekibiw.pdfIn PDF document text
    • http://benrassam.com/uploads/files/75907687223.pdfIn PDF document text
    • http://qwerty.pl/_data/file/34760758453.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/xafilikubumunizikunal.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/11789017755.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11687551183.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/mejuxipesus.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/gavajuparor.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137eeed74cde---peroxuritabosatum.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b508f488ae---mifibinezoro.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/nutumaritaguguv.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c564ca9f61---kazasugoxogegerikedubu.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/jakufokoreberojuninebe.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/20467619569.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/gusajizaniwusosapup.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/93011028827.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/tifonotugukutuza.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5a91386ff4e463c6a70051cc2d6305e6/toparapofabanunizinuni.pdfIn PDF document text
    • https://olterus.com/contents/files/sedejulowi.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/foniruwize.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/zesaliv.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/70653277843.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/66114489511.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f07ca52f74---58130706679.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_off0000c890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC890 18768 bytes
SHA-256: b14add1045b1acdf33a5dc8a7799f1ae926a7b62061df2c2183c9ee6d567b433
font_01_sfnt_off0000f8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11104 10476 bytes
SHA-256: 8751b7a5d96c7a4bff937c2ee8c98eb1faa14765add1c4b65c3a0f53187bc59d

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