Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbef74df1e83cf6…

MALICIOUS

PDF

74.1 KB Created: 2021-09-09 10:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98d604fee84e251073b1e65377970b08 SHA-1: 71999001e451f926c6cb42124dc3c899f93b344c SHA-256: 9bbef74df1e83cf62953dbfa8dca3a8fe3d8186d48cfbf7758d218f5818fdfda
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, suggesting it may attempt to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many pointing to compromised WordPress uploads and link farms, further supports its role as a distribution or phishing vector. The primary attack pattern involves luring users to external content, likely for credential harvesting or further malware delivery.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161379950d65ce---mikezusose.pdf In PDF document text
    • http://lor-rostov.su/userfiles/files/besotijenubule.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131633dc7e05---82901471222.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/wavevigademan.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613230570efd3---20040755571.pdfIn PDF document text
    • http://cityfate.com/files/files/54136839379.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/fukezomo.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a52fdb03b---zemedotuj.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/45501472940.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/63876572548.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/23847381664.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/zawewosuvetod.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/pidujuserozewufaziv.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/jumojoralu.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/jigikovapagotope.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/93299271012.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/biwom.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/dikirorog.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/35054914666.pdfIn PDF document text
    • http://mc-opony.pl/files/file/45444616247.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/bogeluvozojibexibatafegin.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb31c9dbee---5130037409.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/lupelimuvonin.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/muredizajigufenipekovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=a+composite+numberPDF 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_off0000bf4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4C 10548 bytes
SHA-256: 5bc3ecc811ed5cfb6433f20f3fb6194d6085b2d092ddf1d597fc30bafda31442
font_01_sfnt_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 17128 bytes
SHA-256: 4a6616809b9acb1040e0466935bbfc89d69947023f13f6988ae7a8eff696eea2
font_02_sfnt_off000102e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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