Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c9911ab8e6d504…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 05:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf5e0e9a5bfa940d0ca30fde1edfc61b SHA-1: 5bfee46a4d19057c54579a7b4aa4a1e0051bc13c SHA-256: 04c9911ab8e6d504b7ccf570a7bfaf2572bbc78a049377ffe8baa8badaf4da4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://wastran.ru/uplcv?utm_term=10th+mp+board+time+table+2020+pdf+download PDF link annotation
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/87908210285.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fukkgl01riiosihaoe7nbe9eo6/vuwejazo.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/kijawabovuketut.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e6fe103fd---suvetuzusa.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/fe9a71bc316ce700d5360b4746dde0b0/34196561253.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210821_3A8BA18EAA9153E4.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/80423458195.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/91822157384.pdfIn PDF document text
    • https://estoniapools.com/contents/files/25648111609.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/om8oqdhaqkkol43vcn6n3uuv0e/63683191183.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/63761273833.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/javuvalovonaguwewafuvujex.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/39655401365.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd5588f202---bepid.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/85459929669.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/99317674398.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6131810964.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/bigobadewigopatokuloz.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/7732597590.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/83126265760.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1741d65817---bolonasorurepovuruwoxoti.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/48711900321.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC391 11020 bytes
SHA-256: 058d8402c2f5b33d46217f44da30407f70974a66842263c9bce00834dbe253fc
font_01_sfnt_off0000dcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 17812 bytes
SHA-256: 2e2caf82e53ed8fb38e83b245d357e8b9bda716c0ca54b37e2f4e9bdd96e5f2c
font_02_sfnt_off0000f81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81B 17176 bytes
SHA-256: a2c1001c09f3a329dbf1c503cb58acf43bca7477897eba0968e75ee30282ddf6
font_03_sfnt_off00012452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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