Malicious PDF — malware analysis report

Static analysis result for SHA-256 3857f0e124f994fd…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 21:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fffbde581f9eb964a513175af9fb56e9 SHA-1: afbfc6999bc828188d02f3c664553b5b71b30178 SHA-256: 3857f0e124f994fdac74ee5a7a4c50f542c39e3e573575560e11be88673e54e5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS uploads or disposable domains. The primary purpose appears to be redirecting users to potentially malicious content, likely for phishing or malware distribution.

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://movitecnic.com/ressource/site-image/files/58473584692.pdf In PDF document text
    • https://bandotrading.it/uploads/file/8898792606.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/6197006327.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161005a692af74---12973776037.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/vilimaranadewen.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/zujekivup.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/57286bce959f21debfa49144d2620a6a/94561337561.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/80e7lsqtoh7buvo7ftnkqg61k2/nezigafebesiwalomevax.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0dpg7gcf5dkdqdmi2vqj2dftf5/kosolikubaji.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/lomelugaledifoxi.pdfIn PDF document text
    • http://klhl.com/userfiles/file/80934625278.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608258f4f2def---sagoximerefigured.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/duxij.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cc3d045f2---2551312457.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/40728433570.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/70506608c992952ebed644cd8ac125e8/51536360880.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/wiromedo.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/491884828.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/wapaligol.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/rusosiliwugabesada.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/jafasifu.pdfIn PDF document text
    • http://bjallstar.com/upload/file/73834217959.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/53719021705.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/nato07dvor1b42mur8qs9tsd03/regatazikonijubovebuban.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=broiler+chicken+weight+gain+chart+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF24 17324 bytes
SHA-256: 3fddef7ada39338bd088febf06633b2b7928ce07fe5811e96cfedc903f964e4f
font_01_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11439 10960 bytes
SHA-256: 538a8849f5126c284dd43495dde7d4d1a60dd04618a3188ec76cee740af4b259

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