Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e710aa94127cca…

MALICIOUS

PDF

70.1 KB Created: 2021-09-24 13:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00cd1e11e3bbda224cc0d958a3148174 SHA-1: ed0197a2b0a908a22d753025f8159044a2a97eb3 SHA-256: 77e710aa94127cca31b54c54f4cb0bb6f2b3921828d21fc405153b7989b8556c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and redirect to malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 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.
  • 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://erpsamik.com/ckfinder/userfiles/files/mugenadapepobu.pdf In PDF document text
    • http://bigbulkbags.com/survey/userfiles/files/42152128272.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/28061949214.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/gedale.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614a0d244a8bd---69581090872.pdfIn PDF document text
    • http://babamoleskine.com/files/file/dowakutevire.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/27456351247.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614369da92598---40990435256.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395acb45b90---wuboxotitonutumumaluj.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/buranejufakijofix.pdfIn PDF document text
    • https://turbooto.vn/upload/files/61140205830.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/28036262072.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/19758908517.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/pisiwibofawonaxubufajez.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/52466093869.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/88132968931.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af45a9737d---gudiwejegive.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/d9b7n6ite6srs3s07akhppkr42/duwuzafuwizebasumafinod.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/3870048122.pdfIn PDF document text
    • https://davnosti.ru/upload/63935408160.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/zitokowodifemivubes.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/totajurunofategege.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/70277672074.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/61448851084.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb4d497212---29035676040.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/79258167254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=viddly+apk+downloadPDF 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_off0000b259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB259 15936 bytes
SHA-256: 2ff1d7344cfb043ae5711a5858bbe8b43985cc4f737dd26cec0e920fd729c4c9
font_01_sfnt_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 10148 bytes
SHA-256: f85672ec4f2fbe15bc043799133a853b0dc8cf1df05cec742936ee99478b28f0
font_02_sfnt_off0000f174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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