Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7c943e6bed8544…

MALICIOUS

PDF

96.6 KB Created: 2021-07-03 07:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dbba3d2722960d366c72675dca95921b SHA-1: 6c6ff255f85e17180a124d4c5cc1dd2d7fd51310 SHA-256: 2a7c943e6bed8544952fea564ebbd1e15885d431c716b09695c64fb1d4f16984
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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 http://newgrids.com/userfiles/file/zaniwazanokutoxa.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0ff6001c---figipoz.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/vonepanisimito.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/79744459252.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/31d8ce5811a2af7f0edc1e99b5975663/50731067465.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/19518211746.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/25435308506.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb4eeeb0ae---mefizilofutenibawewiz.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/tolideputibisar.pdfIn PDF document text
    • http://waltonjohnsonfamily.com/clients/870437/File/napajivulob.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/flagilokvfu464kis3c90u5d11/gatepikusu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609eab35737ea---mufofupavezenanariwekikag.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f39e4a5fe---24647981159.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/63a58dd7175f8bbdfc2b83396984e42f/nomotodune.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ce7beddeb---mijapodiduzoluguzotemixat.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/4m8dq698861s10fg4klmjf1d95/joxuzukekivaduxofa.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800bba40a70---zolagozul.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607caf3be62dc---97782875221.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/231adae4f6ae5d5e4e4d85f7ab72a22a/xezafegojefitoxol.pdfIn PDF document text
    • http://apcmagon.com/userfiles/tulejixizidubexudomi.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/869f2ea2610d95bacc603c06bb574587/wusulul.pdfIn PDF document text
    • https://le27.fr/docs/file/59600592600.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb47bb6b701---sokujijinojakud.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ad297e78---zuwinitifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=biblical+meaning+of+jaelPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 17868 bytes
SHA-256: b45a2ecd572f2e0204a8cd7f3b9b2f1539c01dc645065cf14cbe275e5a20af85
font_01_sfnt_off00012e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4A 16304 bytes
SHA-256: 487c890ed53db610f6056094ae3127b9b7e82c414539e96d1524f34bf74e1ee7
font_02_sfnt_off00014485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C9C 10636 bytes
SHA-256: 3fd01305df7e23f9170b84b136a560b6b0835c34ef3213afb0e49261b60d9746

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