Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a46851473982de3…

MALICIOUS

PDF

88.0 KB Created: 2021-09-11 08:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 055be229205589b5191016da6b276483 SHA-1: 1f57a68bacdf45622bdf160ce264a02640b2a14e SHA-256: 1a46851473982de3f55dec434783587cedf3cbc399218acdd53cd362e16f6c9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The primary goal appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

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 https://smidgel.ru/uplcv?utm_term=php+frameworks+2020 PDF link annotation
    • http://cleanking.net/userData/board/file/vebakunasufoforil.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/fogokaju.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/78271845097.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/xojenexane.pdfIn PDF document text
    • http://jucal.es/images/file/wakofozigunoladizet.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/15297447150.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/17272897019.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/7175834131.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/zuzenenilo.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136e84350fec---zawuzaz.pdfIn PDF document text
    • https://greenways.at/userfiles/file/52504537311.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/14914116563.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/daduxowazam.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/61714309614.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/fidemafulojo.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/zirepa.pdfIn PDF document text
    • https://network-italia.it/file/zefiranukajegokupalipurul.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161385a0a7f1fd---12408369469.pdfIn PDF document text
    • https://koratspring.com/upload/file/20165772960.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/perofugisoxupofovirelama.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138bdef57501---dogogarinoximas.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-11/20210911103222375820.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/28760329828.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bd8ca06ea---53004131865.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_off0000f2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 18012 bytes
SHA-256: 7a25ea4b6428616a5600543e1a69bff5dc974e582ca336bff61b8d7cacb4aae7
font_01_sfnt_off000121a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A1 10704 bytes
SHA-256: f8100f45fb94fe20162f8986a43c437a8170dd224a3d3ff040d641a84d5e6336
font_02_sfnt_off00013a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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