Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d702e1ce1f9c8bc…

MALICIOUS

PDF

87.8 KB Created: 2021-06-28 19:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c64465468ba0e7b9b279d21848dee806 SHA-1: 786066c4f90b1a3ddcf7f1577bb09119a3f61cdb SHA-256: 8d702e1ce1f9c8bc18245ac91b642a80b33a10be68376a902dcfc3c881fbc79d
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to external resources, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or scamming operations. The presence of a link farm on disposable hosting and compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c950fd9114---naparuxalefomuv.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/484d1e8a8cb4bc6f497b62c1eba3c998/getijamuvinun.pdf
    • https://ludifrance.fr/userfiles/file/51513801311.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089003197c88---dulizaxubuju.pdf
    • https://www.neosynapses.com/wp-content/plugins/super-forms/uploads/php/files/2537m4rgfn0ekq0b05tff0l52i/11199506555.pdf
    • http://wooshin.kr/uploaded/file/272909753609f9dcbda3b7.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f69b454a42---27903958796.pdf
    • http://sosnovgeo.ru/userfiles/file/fuduxozufil.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c41302e11c3---73948085460.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c0b37da50---21651547699.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c347ab69a3---37179051918.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864ab4c689b---84063576906.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606da0380ea4a---tomirube.pdf
    • http://przedszkolenisko.pl/userfiles/file/78329349805.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/tomimubim.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b34345e8b084bf21b50cda9d11cae3d3/60800451854.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/676c234a6817c2edd390c0cfc0d131f3/lozedawoborazizarubevisep.pdf
    • http://starcity-vinhomes.vn/app/webroot/img/files/ziwazisutovunarapa.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/78ad93e259f89fd617477765cdca8a2c/99114100313.pdf
    • http://fmi.lu/userfiles/files/lukeketukidugixigirus.pdf
    • http://ekolojikweb.net/upld/userfiles/file/bewukijelefabipazotog.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/466288613889a350d37abec50f3272e7/nuloruwaxekubepibufap.pdf
    • http://rideabikenews.com/user_img/files/melowoza.pdf
    • http://asja-doll.ru/userfiles/file/40691382472.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/khkf72521se5nabpa7a2a7nrb6/69596940275.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=example+behavioral+interview+questions+and+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f254.bin
f926f173b1429ad080ee965e7e852b59ab9277d4dcad76721a19f704526d7398
pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 17552 bytes
font_01_sfnt_off00011f40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F40 16792 bytes
font_02_sfnt_off00013757.bin
b372a728748f454393d00065dab4ada3a707f3134d0bca7a1e80c8dd6a42910b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13757 11280 bytes