Malicious PDF — malware analysis report

Static analysis result for SHA-256 747720a4528f33a9…

MALICIOUS

PDF

69.5 KB Created: 2021-09-10 13:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 42fc06838f873f9f12fb691086571a0a SHA-1: d4d722f56666bf0fee290763191079d8d3ab7fb7 SHA-256: 747720a4528f33a900a432eb011b961540f0f14c7aa76bb20404b866eccf7989
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of embedded URLs and the nature of the link farm heuristics indicate a likely spearphishing attachment used to distribute malware or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://archism.ru/uplcv?utm_term=fortnite+ps4+hacks PDF link annotation
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/86176466663.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/57679665110.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa46880228---77767145008.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/20381756273.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090206125470554.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/ledisunadetevun.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bec794272---lelojimosanenazopibuw.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/74936638933.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/magafe.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/67886450976.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16136e52b10b5b---bozebarupagij.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/wafodutefofin.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161399413d6e3b---2712343611.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/1355478049.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631233592dZ4z.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613abfff8f9ff---giwubeg.pdfIn PDF document text
    • http://hejia-ele.net/upload/53423094629.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/97881740928.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/xoferi.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/53415857104.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/42134042859.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/66768909721.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_off0000b0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C2 10572 bytes
SHA-256: 1ae2d6e7b5efb7d8ef8afbb6bbd14217f7469863b25d64e5e6e9f501ead0b2ed
font_01_sfnt_off0000c8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F3 15692 bytes
SHA-256: 6c5ec349317f6da7542a94b858e25b83a67d047def30f8bf4d61b9d4b3fefd52

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