Malicious PDF — malware analysis report

Static analysis result for SHA-256 143ad15924fe5fa6…

MALICIOUS

PDF

82.7 KB Created: 2021-08-22 15:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 51b84fe37c3128379064b91c40f60f90 SHA-1: 5425a01be2bac0bc5125cdbf622d150d4b8f4acd SHA-256: 143ad15924fe5fa65fe3b7eddce34900cb713344eceed61ab274a3524d42068b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or redirection scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to direct users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://synerhu.ru/uplcv?utm_term=atoms+and+isotopes+worksheet+quizlet PDF link annotation
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9361e8840f---sijevuvu.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/dakirorubik.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/68905067087.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fd8ae9332---dezazuxezakazaranelenog.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/5v4n13o9268aasgje2aerr6e7d/wunow.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///bekadevuda.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a837ada580c---23855830690.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/jodatunuxiwogumareke.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/selozanonaponobe.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/soketikos.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ac43799c66201867aef050cc84bb4544/ragomimadanesam.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a83bccc4853---7974177909.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/wakemobazajavamiva.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160793d1d08235---gijimimefuledefi.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/kulub.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93949590327.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/72430750772.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/winer.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/95pdqhdu6tuqdccddl0fictijr/kegogux.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/66272845585.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/gedoranovolizuwuker.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/3316865100.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/jusonilil.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca12868cfe---60914116392.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/7a2qsjdefkiq0425rf45mi7bk2/xupemimezopinopokepexel.pdfIn PDF document text
    • 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_off0000dbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 11120 bytes
SHA-256: c8ae6267671916b63098303331a19e31984d505f9b18c6c59baf4320874371c0
font_02_sfnt_off00010d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6A 18404 bytes
SHA-256: f7aa6eb44f82d6071a207c448159259c616599d8d5ce6aeeefa49ff4478fa815