Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66382cb105fe22d…

MALICIOUS

PDF

89.6 KB Created: 2021-09-18 14:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df495936e3c89a49694ba40204f239f6 SHA-1: f19a006466979382c25d5987d06787d8ac6cc21b SHA-256: d66382cb105fe22d5ec10ecd332a02704283b8d05ecede8204e1cb70cd25cd1b
176 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or link farms designed to redirect users to potentially harmful content. The heuristic 'SE_CALLBACK_LURE' suggests a phishing pretext, likely aiming to trick users into visiting these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=pdf+maker+movie+apk+download PDF link annotation
    • https://xtremefitksa.com/ckfinder/userfiles/files/1702960538.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/72199447404.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/lojinomimosawebek.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/98980783207.pdfIn PDF document text
    • http://weldingplaza.com/files/file/46765581315.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614418a0eadac---wukebibekidodefukonileb.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///22358600148.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/508e1348252d041d72cd23f193979e34/34239612635.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/sonoxorefikilamijuvavib.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/51351184965.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/19738485442.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/59007330873.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/37198243505.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/mupalobovezavinozetarob.pdfIn PDF document text
    • https://owop.challengersports.com/userfiles/files/topesopezasivemijavefoli.pdfIn PDF document text
    • https://tl-systems.hu/files/files/wiruzigadeso.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/16312426935YgA.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/vujavijesususenog.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395b7a0947f---vezosotetixakub.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/jokixasilulogibiso.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/30225369288.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/65261036968.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/vexejonifupewuxexab.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/543765013.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_off0000f960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 10636 bytes
SHA-256: e3a3a845caa2b1bb582105917be49dfa12e87bb7f94e76321cb14d03c60f233e
font_01_sfnt_off000111aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AA 18148 bytes
SHA-256: a9bbdc01d335d5324a00c86d9b006e018beb39f82707f2e37c5a2d7afbdcefa7
font_02_sfnt_off000140b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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