Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a3ab3d7478a7ce…

MALICIOUS

PDF

85.8 KB Created: 2021-07-02 20:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f190ba8ff5592202710f1126b45c299d SHA-1: 73a72e2043081a57a99499912d85c4bbf7acc0d7 SHA-256: 66a3ab3d7478a7cea01ff2408d2cff5c9ecc12fd4db4bfe1bd49a0854f6d6360
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress upload directories, suggesting it's designed to redirect users to malicious content hosted on these sites. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially compromised CMS uploads supports this. No scripts were extracted, but the structure itself is indicative of a phishing or redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://zpb-maciejewski.pl/upload/fck/file/76937101540.pdf In PDF document text
    • http://hakkabrothers.com/userfiles/file///fuwukanamenazat.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/154adefc03b47b65e677bad98608f71e/12134683964.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085b8a6b113b---luxemawijibipo.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af74e213665---61278870569.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/77333712717.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a30e0b153---83726876710.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/5290747705.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/xivojubaxugepobozorigoxu.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/0fafda55462b74b3c7dbda5be813310f/48636599441.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f74256e1871d25c34a7f34d2b8cc74ad/rifovarovevupitorib.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/572fp8b8thtbh513bf1o9t81sc/rifaxikugopifaz.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e794af330---sidekomavixafodiri.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/gf2n7ilhbm0sg3cis7aai0k6hg/gigivezo.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a765705df5---89004477366.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/5b552d2578bc08156de1f4310615d645/dosotevidezotojigi.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1d1e206733d09806d7b0d942bc7ef5fe/bojilelana.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/99154400179.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/powamoj.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/99076721840.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160704959ef72f---66001065397.pdfIn PDF document text
    • https://x-software.cz/data/file/sowefed.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/tegozisodegiwanape.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/cb5c16b08925a50fdf029c3d151d6c3b/jagarigedulubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=from+jpd+to+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_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 17328 bytes
SHA-256: 76362eadfebb15d5ce97a1bc3c01908623c5658bc7a39df24523e69edfe52ebd
font_02_sfnt_off000133e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E0 10060 bytes
SHA-256: 54c1ff05279461d126930bf7ad11f6e8ce292cc00feaa012761a810f2b01d73c

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