Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e959721b0bf4555…

MALICIOUS

PDF

99.2 KB Created: 2021-09-03 16:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c3d3dbd18b9a425f94ed4c64ab31df0b SHA-1: 39eae4d31eb4abdf5655780298bb58019fe14ed9 SHA-256: 9e959721b0bf4555b71e115e874a1dc2df888d741cbda059c43f3c8255107567
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The PDF structure and numerous external links are characteristic of a lure document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/ac52a1f282ac44f829af3331a43792df/16822159128.pdf In PDF document text
    • http://geoman.cz/data/file/teraledafeki.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160732ca7c76a0---72847398776.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/80232566378.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1622464014.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/87624728065.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082428763431---wunufidafagu.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098343ed9da4---bimanutezemupapewur.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/kagekin.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/muvupo.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/sarurimabumalubuk.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/bmk6oiglmucm0lmn5sg69vluc5/15241320362.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/c57ae69e890b65d201aa4126b051d53e/megulifakidaxesadosozula.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/jbrn1quj02hkchdqouk0100i2i/16972446231.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/e25a54cddbb08b30174d623b230a175f/garonubajatufejilejetuli.pdfIn PDF document text
    • http://pk.mo/userfiles/file/62051474280.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/9d645d19f6deeb74fd925a7525d6c556/nitosikokoxexepugem.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/52921123213.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210722122806_ZnVrdWJlc29qb3BpemV4ZXRlZA==.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/ralugotojibovakuvugalew.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/94724575223.pdfIn PDF document text
    • https://marosme.ro/hirek/file/74144450251.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5ca3539b7---xazomokotebifulino.pdfIn PDF document text
    • http://melvin.cz/data/karud.pdfIn PDF document text
    • http://polipack.ru/content/file/wilori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=anatomia+espacio+epidural+pdfPDF 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_off00011b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001331a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331A 10864 bytes
SHA-256: 0612295e19746163759b9b906d7faff3f3b7d111418ad2612e1d7d6bef43e4ca
font_02_sfnt_off00014c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C32 19564 bytes
SHA-256: ddfee4f541dc8c6adcd15bf83a41fd8d6a0760b25a5890923c242517d626f2b9

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