Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc02c2f33169a45…

MALICIOUS

PDF

86.3 KB Created: 2021-08-07 07:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a98982b8e9b2b2856997f00a87ec944c SHA-1: e4788c3603e706bdefe9f9ab04a4a142269d123a SHA-256: 4bc02c2f33169a454aa0e5cef4bd05d9704e0266bc54979b272966d3c5bf0fd5
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are designed to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4a9955b7604fecb5df709e0e2a2290ba/66246701786.pdf In PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/banozuvusazotulugaviruki.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/a1f2c0d39a6988e51cdd23b34e7e8c15/fazenilizawesusalizuxok.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608979830a85b---jokejekafamepan.pdfIn PDF document text
    • https://aildf.in/userfiles/file/21983085097.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/6899791872.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/45180670635.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/sagowinas.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a862873be2d---51866498087.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/lebox.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/getajemibidekikomap.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/11210856754.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/timedinosufefajexul.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/nimemomabeleduraboke.pdfIn PDF document text
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/9310831352.pdfIn PDF document text
    • https://airbays.com/userfiles/file/18084253556.pdfIn PDF document text
    • https://alev.az/userfiles/file/92636918720.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/sikexegilinogesave.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/91207002690.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc8f8b1bb4---67819074520.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c0b5416d9d8d15d8d1201e4ccbc25573/tuporixidijibi.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/77528508503.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081100e268a3---ramugemefexudemokigedine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+connect+tp+link+access+pointPDF 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_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 10436 bytes
SHA-256: 6ccad0ab01e469a6b81249a715cd881a005444cb2059afcb811b0eb34c7ccbdc
font_02_sfnt_off00010b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4B 16076 bytes
SHA-256: 0491ab1f9781984131449868ed95f15036bddabad70a51597ae233fa8bdf08d0
font_03_sfnt_off0001206e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206E 16472 bytes
SHA-256: b903c4b285902bbabe02727ab22a7e6940aabf0432586979c20839012c2be70b

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