Malicious PDF — malware analysis report

Static analysis result for SHA-256 013893bb15111c42…

MALICIOUS

PDF

72.2 KB Created: 2021-09-05 12:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b79300dad69b0e4f649875162715089d SHA-1: 3c7087c8c94082f81ec2e73727e9eb99d6a7a140 SHA-256: 013893bb15111c42b5fc07a22e9db14427fb379b2870dcea511c01e895147593
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised websites and disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.lire-les-notes.com/ckfinder/userfiles/files/50643467873.pdf In PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/vuzebowodi.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c2c1be26a---jovulifesiv.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/75814544771.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/natasupisizemeneleba.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/7p36v55vru1nlk59r00epur7b2/pisubiniterozexafux.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160acf50bdf70d---jituzojozobuwegajizerapat.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/welin.pdfIn PDF document text
    • http://jpmoto.biz/upload_picture/simunewepijuzo.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/nu3u00jphd8ct5njgt562485h1/mozot.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/f9d322021a73b176033aa59e55cff1b6/wizew.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ecb4cb6cbb1e3f2ed4d7500c0a1edcf/62594873078.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160725ba466285---zepimexowanisutojivi.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c4f226bc---33028036080.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/pejoganiv.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/giboxud.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/64828147950.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/20663270369.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b1887fd57---75641916973.pdfIn PDF document text
    • http://banquat.com/userfiles/files/dufikupuvopenesim.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/nawuxogek.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/b36d425d1880f84122492c30197da8b1/sodigaguwelig.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/30173515154.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/7c9946f7c6718cd04fe96f430d628267/jowanifaxakijasojupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=glencoe+mcgraw+hill+algebra+1+homework+practice+workbook+pdfPDF 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_off0000b732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB732 11308 bytes
SHA-256: 3a1e3b264875847e6318b9a349c5f81e46f19bc3ec7fddc91910a22887fdfb3d
font_01_sfnt_off0000d139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94B 16052 bytes
SHA-256: e1c7254c60a1c6e95211e250c58bf6b52be342ed7473bdbf459625f83a13b939

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