Malicious PDF — malware analysis report

Static analysis result for SHA-256 4127f98b12222ba3…

MALICIOUS

PDF

87.7 KB Created: 2021-09-20 16:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 825c2d70319d2086d78af6f9e564fc72 SHA-1: dac49db2f1bc225801afd3e20df1d6b9fbf420a8 SHA-256: 4127f98b12222ba37eb83ea8b0531c2272523a31134e450a359336d87606bb3a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or conduct phishing. The document body is unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a clear intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16148018626bad---dosuwale.pdf
    • https://afritransport.com/app/webroot/files/file/49637041482.pdf
    • http://kristiankutschera.de/userfiles/file/fufiwaxanoxutir.pdf
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/35153891228.pdf
    • http://dungcumaymoc.com/Images_upload/files/24237216785.pdf
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/volugonapoj.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1c76e9a2f---41781290521.pdf
    • http://kwong-cheong.com/userfiles/fugedababipox.pdf
    • http://bebaldebaran.eu/userfiles/files/begolek.pdf
    • http://glina-master.ru/admin/ckfinder/userfiles/files/2049402857.pdf
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/nasiberiruwepuzogufo.pdf
    • http://euromarkcreations.com/new/fck_img/file/62519117668.pdf
    • https://bimetoor.com/basefile/bimetoorir/files/vimewikosebudawil.pdf
    • http://househouse.it/userfiles/files/15886274245.pdf
    • http://fosterfreezesantarosa.com/uploads/files/68159092891.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132658d9f997---lobewasifejobiraziwupisak.pdf
    • http://aal.tw/uploads/htmlupload/files/bupotuvitewofuranenux.pdf
    • http://langeline.com/ckeditor/upload/files/xilolejoxeki.pdf
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81584376437.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135b17b0dcc9---28989494509.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86e4172ab---38377908825.pdf
    • http://songpinhao.com/userfiles/files/teviboza.pdf
    • http://orderkai.com/uploads/files/tuvuma.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=deleting+internal+storage+android
    • 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_off0000f318.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 16792 bytes
font_01_sfnt_off00010b2f.bin
715aa15fd77d4582bc4d440949ca15021aac8bb08e402580bc512a138ffc8462
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 10424 bytes
font_02_sfnt_off000122b2.bin
64d5d1680aa9fc786be691befb9417a19a238c11ddbe48825659fe2f88623f7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x122B2 18156 bytes