Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47201ed196bb7c7…

MALICIOUS

PDF

87.5 KB Created: 2021-09-05 23:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e9f9a7c91c0779ebf814aa64a9f0663 SHA-1: e6f9ca7a44c6dab468d5bfd1153dc18eef9b53e2 SHA-256: b47201ed196bb7c73b863ecbccb8b55b02c977dfb94bdbfa5071e5d92ec93d78
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect the user to malicious sites. The PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://dehayemek.net/upload/ckfinder/files/92608357961.pdf
    • http://sjhrz.com/images/upload/File/vodufasi.pdf
    • http://kcde.kr/userfiles/file/50267845024.pdf
    • http://trevelci.ru/ckfinder/userfiles/files/47758217876.pdf
    • http://msmzizkov.cz/data/dokumenty/19504788268.pdf
    • http://geologocarmignani.com/userfiles/files/bebepuzopat.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/vo1jgi83ha7ig2m5l41vnv8ltk/volena.pdf
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69906852198.pdf
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/reraminupexajivofi.pdf
    • http://2990592.ru/ckfinder/userfiles/files/8759236474.pdf
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/10594343108.pdf
    • https://viadagio.be/userfiles/file/80402419990.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/r93i13juhurug5ni9tbhqfutul/2975022431.pdf
    • http://flightshop.jp/images/blog//file/jewutesobasana.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b27d75bfcbd---dopaf.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/15184975185.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bfbde4c5b---55358177110.pdf
    • http://thienanglass.vn/upload/files/bozazumulep.pdf
    • http://kayamedbursa.com/userfiles/file/14850944647.pdf
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/u1j1i20kk18638agj03djqqcsa/mekexotuvifu.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b734f3e82---81621801962.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23d30079d---josalezarajujunufareto.pdf
    • http://slhs1958.com/clients/18590/File/bafiserare.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=aids+to+the+peripheral+nervous+system+pdf
    • 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_off0000eeb2.bin
d39ff868ded1f1190f26694507fcc2384c35cfc36d9af53263364f87e5d04de6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 18776 bytes
font_01_sfnt_off00011ead.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAD 16792 bytes
font_02_sfnt_off000136c4.bin
1b2a16f06413ce59c10a3c710b42b17fd9c2ad3469589c503da6db997d0a307c
pdf-font-stream PDF embedded font (sfnt) at offset 0x136C4 11024 bytes