Malicious PDF — malware analysis report

Static analysis result for SHA-256 aecdf669b0e95229…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 05:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f174977c71bcea81849fe60c501f38c3 SHA-1: f62c31f5508d5ba4e223d8952be3f734d8b283c6 SHA-256: aecdf669b0e95229c9054b1b44975be1e8dbc0e6703fef9d17e835a5b76e3918
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple potentially compromised or disposable hosting sites, designed to redirect users to malicious content. The presence of numerous external URIs and the 'link farm' heuristic strongly suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://balone.net/_upload/file///14868772116.pdf In PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/38339491132.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/81815506657.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/b70d1f19ae1748711c5999ce828dd417/supejom.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/20219172119106532.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/66777637076.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/7747131716.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/dukodifofif.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/munukakotuzijinin.pdfIn PDF document text
    • https://cncunse.com/d/files/jimolofopojapi.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/tobude.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/36340055865.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/0f902b40869da98b3360ee49be77352c/tazugi.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/kimikexexudoxogezosano.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/3492866738.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/23027283827.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/jeporatiwemigusineruxigav.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303eb819594---gejilibejoretiriwege.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/sunakoximaxevuw.pdfIn PDF document text
    • http://josquin-capella.de/download/26232126741.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/tuzisififepijeri.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/93324859970.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/86303660824.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/50734472328.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/xopusapukukamisaberap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+get+real+robux+for+free+2020PDF 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_off0000dbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 17404 bytes
SHA-256: 8ee3e5c71250d9363cc328317433c4878820d646da0d57e0d4110ff0196e75c9
font_01_sfnt_off0001092d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 10684 bytes
SHA-256: 22bc4296a8dd48f5d796136b4ea671ea7dbc9bfeffd0c44774997e7204c80c18
font_02_sfnt_off000121f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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