Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5030c4432500fc3…

MALICIOUS

PDF

98.1 KB Created: 2021-06-10 16:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fd4a439ae7870e8bf763df7d8f8f03e1 SHA-1: 7b70686b5970034d789fbcf3fb49427c689911ef SHA-256: f5030c4432500fc37fa8ceb48590f648249ad95ffbfde0a6c2ba54256a91cb0f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of a URL with 'voice+changer+to+female+apk' in the UTM term indicates a lure to download a potentially malicious application. ClamAV detection and ML classification strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://krisoc.ru/uplcv?utm_term=voice+changer+to+female+apk PDF link annotation
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607baabcb1bd8---roxowuzox.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/tujobekeletibopawim.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/zifosawanif.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/wozidunopaderuku.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/dfu2f9cjl7pbga9ud7ilakbjdp/87596897312.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/bc2roc7snbk6dh7vcuueopj5e4/newowilakedoluzejobe.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/2124d3a793672dd28dcbb33ec66c61c7/jilipipafaxopakiroza.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acac4e2e663---gewilumaludawifeso.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/fazipoxifuwomejosoj.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/25569431958.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/28902445496.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdfa9bd014---23091916947.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160af7fcd764f5---6637020435.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a23006412---67937993336.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab9fc10b48---28619202695.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/d1fbecc5182b8bf664e2e12307f4cea1/ketafoseded.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3721029ca1---gutogezofewew.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a13e2c3c2f2---lopubuxipekimawipe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 5280 bytes
SHA-256: a0ea02b504fafd4165947087e05cedd93aafbe882191c17b3d450482386e13c6
font_01_sfnt_off0001074a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074A 11160 bytes
SHA-256: 95b163c0685fe8b83b6fc472a4400b5c4ead99540237572228b34c07fa2dbb81
font_02_sfnt_off00012a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6F 20020 bytes
SHA-256: d4c9a0615c01509e6fab3601a4d87a18746e1670012e41548fbf39ccd708b948
font_03_sfnt_off00015a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A19 17264 bytes
SHA-256: 32e0d2591067435461afeb8f52c18b4559ffdb2c1a42b4ee1e9f1cd27113af41
font_04_sfnt_off000172ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172BA 1736 bytes
SHA-256: 1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19

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