Malicious PDF — malware analysis report

Static analysis result for SHA-256 807ab7bc4e6789e7…

MALICIOUS

PDF

84.7 KB Created: 2021-09-14 22:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68ec352c897b5d4dbf3a7340d8eed684 SHA-1: 5cfc7f0011d2692c7a018986b6c9b7cba972baa2 SHA-256: 807ab7bc4e6789e76418c59605d4582eedc2f9991c9f340739b3f51a5e76c7f9
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The PDF contains numerous links, many pointing to compromised WordPress sites and other unknown domains, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of a link farm and the overall detection as a trojan points to a likely spearphishing attachment attack vector.

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 https://zoldlepes.hu/userfiles/file/vivibojaw.pdf In PDF document text
    • http://bon-mar.com/fck_user_files/file/70978949669.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcc23785cf---30827443004.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/sejuzu.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/figaxesezu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/wiwoxuxenitogirexinaf.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/aef701e1b1e64f6e0656764b746c1b42/fokogovap.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/mewenobolozagavimavorivuz.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/nufubukuzufalipupuza.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f544a8f104---59658048479.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/lusesofagamogilar.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/98109972578.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/julinikogewit.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/vogavuluruzixuroduwolez.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/12351340592.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/riwojapirenofajumu.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/14912390174.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/vejorupaxozan.pdfIn PDF document text
    • http://minerva-collection.net/files/files/2351300164.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/24948830470.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/rofawakafetetof.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/risapamebew.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/varoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pokemon+go+joystick+free+downloadPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/fiwajosem.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_off0000df8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8A 11240 bytes
SHA-256: cc03f600f8b431b82d314ab59b099c6867844d379f9413037ddb190f3f673546
font_01_sfnt_off0000f9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 19780 bytes
SHA-256: 6b737e5f17cb77a6fe9488ead378222079ebb8ee64e6d3a5e54294191781fd5b
font_02_sfnt_off00012cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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