Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85088c13636c7f7…

MALICIOUS

PDF

79.3 KB Created: 2021-09-01 20:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f9cd50a89132066eb48a1d5eb93e9a0f SHA-1: abd0d5a0f3504ad4378ade0a3c90359570164a8e SHA-256: e85088c13636c7f7985d930d32960bf9617e9d3021554a1018a3a6df6028fa34
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or redirection attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://neodentpetrosino.it/userfiles/files/22684307423.pdf In PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/9je03h5buqkvvrsd5tnfj3dth7/jutofikewavatal.pdfIn PDF document text
    • http://raczcsalad.hu/files/vemogofesadaw.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/gizigewonibatedi.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/mukaxodexojitusawub.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/e19e26126e23ce77db76c1880450b6f1/jujonemasitokozerawazisez.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/54435981006.pdfIn PDF document text
    • http://ubest.ru/images/file/3328212706.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/jesafumulokabagizoxelaguv.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5b32c6ed4e0a3bd89604017e135ef0b5/83051488557.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/sobazawexovibikimudo.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eee2d4aab4---93070194159.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/75406500219.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/3cc8d09762702925cce176966243ce29/pofefuzeputogivijutupem.pdfIn PDF document text
    • http://01host.ru/userfiles/files/24734593837.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/3672827272.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/beb3213d51ceb448725dede03da009c1/nuzatoreduvibafelotexis.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cddfe7e23---bakujomunixekamixo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071db26019aa---sivoxobikiralowejuxarudu.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/66977726007.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8162bfa7e---sesubevitorokoralivuxuliw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=kinetic+energy+lab+report+edgenuity+answersPDF 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_off0000ce98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE98 11120 bytes
SHA-256: 2d6afd2e7cf8767a0d8250792133ae277520273f9a2d12b3b048dc442ed58e8c
font_01_sfnt_off0000e848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 18492 bytes
SHA-256: bfacf94bb9d5ec4110d2fa1c47ede0a8abbed03195ac21769d62b6e197b55801
font_02_sfnt_off000117e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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