Malicious PDF — malware analysis report

Static analysis result for SHA-256 843c2f25d4018dc4…

MALICIOUS

PDF

76.4 KB Created: 2021-07-17 20:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 99ad4ca71cea6bcc82249ab13fff1a4e SHA-1: d8e9585ed180f2d7a5da342d06df087693bbde4b SHA-256: 843c2f25d4018dc436925f74f0235549bc4fbb08a6cfbbe263ad53f6cb5e9ec7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm, with many URLs pointing to websites that appear to be compromised CMS uploads. The ML classifier and ClamAV both strongly indicate maliciousness, consistent with a phishing or malware distribution lure. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://clasesholandes.com/userfiles/file/xegipakiduxuxiwuviva.pdf In PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/qtbeoju1f1g4bc5qlom14cv8k3/87101622479.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/646a19ef9cf65f3e695364631cb01206/fujonegubepudom.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ae9645371---xaraxe.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f992a2640---betoxilege.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160aa69c377a9c---47492184678.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/70890541605.pdfIn PDF document text
    • http://exima.kr/userData/board/file/duvijurakif.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/18191299259.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/razil.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/zafoderesap.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/nosokifaxawozemuna.pdfIn PDF document text
    • http://skomi.ru/img/files/file/64555682882.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/d5snehnt7h8jqa86intsm5rtfu/21837733596.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/aa0854972637d36b3e9f9a4c5bd2e451/5432706823.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/manunanu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/090b0450f2a68afe13d07598f1c4af07/98020403436.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45f8f4d4ef---petikol.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/wenavovadovimatixegufuf.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/93950588626.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/fd1508d96ecc993b63183af516b97fa4/94796743457.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/72da014201b7433aca66c0b58a74f9fe/58653126026.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/vabawuwaf.pdfIn PDF document text
    • https://ancoraeducacion.com/images/raladitozolezupolava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=scanned+pdf+document+to+wordPDF 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_off0000c9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D3 16028 bytes
SHA-256: 9dfd3305c7ca7180969abb710f8f6d9ee65f708dfed7eb0ce2a4cdcc83868cdd
font_02_sfnt_off00010b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B72 10736 bytes
SHA-256: 81567bd322e169828e787e7ee1485e3e91f93607b65cdd469a9d12296508ebbc

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