Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42ab9f72eb5e64b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 07:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 65859c429898f6182c551f8d2ebf8732 SHA-1: 962c4a6733d0a49154bde1f8e59d31a8c98225f3 SHA-256: a42ab9f72eb5e64bf299c95bd387acc4c3aae31ee77e9fb700b84237837de231
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier as malicious and also detected by ClamAV as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various URLs, some of which are hosted on compromised WordPress sites. Crucially, the document contains a 'Clipboard command execution lure,' instructing users to copy and paste content into a shell, a common technique to download and execute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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=windows+8.1+activation+key+free+download PDF link annotation
    • http://peterpan1996.it/userfiles/files/24821502367.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/845747079.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/67499580899.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/44386456976.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210911100310.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/53138887398.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/54746916825.pdfIn PDF document text
    • http://coachhouse.info/assets/file/bodasiti.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/nirodojejurowo.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/61883940042.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/737b2318cc2d2596026c3fcc8185b739/11822855672.pdfIn PDF document text
    • http://weingut-suppan.at/files/37861137122.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1dad0cbb2---momibuvererinu.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/menejivi.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/61399916162.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136829a3a629---vosuja.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/jolejedajesegemibosuje.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/ruperiluwekorek.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/dc89ed1dd12221da4bb943de7dbe6ea4/jigitugaruzilibikarowi.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/28737628304.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/rewusafekagi.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/jokomorufese.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/16387826066.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_off0000d6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A1 18848 bytes
SHA-256: ee4e0b4d541c5fc0b07112439da24354e0e7a5983a41a74c46c5f188717508cf
font_01_sfnt_off000107f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001200e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200E 11148 bytes
SHA-256: e1962d01c0443543540314cacdc9753d108a4be1b91e33725926e5847b058667

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