Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22591c981eeeb19…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 14:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b99e8cd3e066cf5091b89ed1cf185d42 SHA-1: 774c395371f824b22526dfe1c1c97dfe6293c4f0 SHA-256: c22591c981eeeb19f988bbafbd82033186b8629c75958e20479c32a9f039abd3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised websites, many of which host further PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly support the malicious nature of this file. While no scripts were directly extracted, the structure suggests potential exploitation or redirection mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pinyardim.com/calisma2/files/uploads/xuxaxomani.pdf In PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608960b88a7c5---vapokizix.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/95482558485.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16119cbd107b2f---lopenalefikit.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210530112902.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/77367357985.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///juwesikapab.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/xufeguxabisurul.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/94516332052.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a44a3863eec---72944229406.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/dlj4o5nvmmujokvlg72cn7fmt1/49939781853.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160f760fbb1223---85372937010.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/80490777195.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/3ato4ok0k0mef66t1jf1enr247/ragamobiwaf.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10b3b7652c---kanemejuvakowedaxo.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/velewupotarufogesexeboto.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/resifudotifusokusasofepum.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db1feb8b5f---balim.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/24599664196.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/386add608f4204e695ba8f168afc8905/paxexe.pdfIn PDF document text
    • https://digireg.lu/upload/koxajutozakaz.pdfIn PDF document text
    • http://babamoleskine.com/files/file/puvanaritufifivi.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/79687870183.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/90757550c80052156d6442273265e0d6/xevirepinugezef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=kennedy+fire+hydrant+repair+manualPDF 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_off0000e83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83D 17024 bytes
SHA-256: c6e37a9b45dfbdb1ba015e50641351701b1853b193d3202cd70cdda7f2313dd6
font_01_sfnt_off0001141a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C31 10680 bytes
SHA-256: e846b95c802e7ff244fb7f60eb453c89f98ec4f09bf8eb766b33be720c5cad25