Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a007809c6df34b…

MALICIOUS

PDF

68.7 KB Created: 2021-10-01 09:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bf34296530f265de65955ff8d2232a25 SHA-1: 12d02799fd13fe8da9760987f5d7142bca2f4d4c SHA-256: 83a007809c6df34bb1234ec15585f9714ee07875060a1e39d1f7cce4104419f5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan intent. Heuristics reveal it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of numerous external URIs and a link farm structure strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://mackits.eu/image/79435606510.pdf In PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379b1e5c3b3---lonewigezapilineleta.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/91203031070.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210909110440.pdfIn PDF document text
    • https://la-klamm.org/Files/files/80907780011.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/84358731806.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/53606299484.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109140234408283.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/vomidow.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/41a1c515610827743298027f67e873e8/muvapezeku.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021100105263573499.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/56242140368.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161504fdf512d5---daxinagabigateliwujajukag.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/ravarejina.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e36667ef74---15353285048.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7e33b2005---26633517901.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/numimakefosiratomewi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f361ebc336e2e00997ff5e5e96fe0588/38753631649.pdfIn PDF document text
    • http://juha.be/_files/file/36689500241.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/40736561195.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/25931816931.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/8045608041.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/209caa27c2d527f082a901b2cd4a4d6d/41672466529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=redmi+note+5+china+to+globalPDF 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_off0000b031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB031 14580 bytes
SHA-256: 3bd99f07ff4ef505bc0c37a871d81b7d36f3aa07f68d38af56c38ac0bbdd44d6
font_01_sfnt_off0000d4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 10868 bytes
SHA-256: 4c055657334c69d27bf726f495b9ddf3700f30a798ce00761289c085cfce58db

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