Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1a65448ea89c49…

MALICIOUS

PDF

86.5 KB Created: 2021-09-23 02:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e7a2f5cb02e13425dc991be9bc59886 SHA-1: 0c38384abb73b7ddbdcd99b5a15a15b249ca9d93 SHA-256: 3d1a65448ea89c4929e10551cef565699f0ce79121d65a4ad7f3fcc4735eeb04
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, including compromised WordPress sites and potentially disposable hosting. This suggests the document is designed to lure users to external malicious sites, likely for phishing or further malware delivery.

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://queure.ru/uplcv?utm_term=six+thinking+hats+sequence PDF link annotation
    • https://profitaler.com/UserFiles/file/91280258641.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/87510475236.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/44669885240.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/bamesafejokefozojabu.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/nutikekuleloxisilanomo.pdfIn PDF document text
    • https://casaalu.com/luutru/files/mujafixanune.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/58054181422.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/toripujukegoxovezuru.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613960b4cff58---famamewagupojogigiwereve.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/moxifuxisuli.pdfIn PDF document text
    • https://aromamarketing.md/img/files/xaletegezu.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/xenotowimixajoxegoli.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/83455100859.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210910151644_3z3jmc.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/54456530076.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/kizovifanoxenupema.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/panijupumobipipapo.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/76773264662.pdfIn PDF document text
    • http://trevorhannant.com/fifatapevafojiwamupisive.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613415f9c8066---59989241641.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/6cf28e0a041f68d326f06b59c9d70018/1921698723.pdfIn PDF document text
    • https://tckontrola.hr/files/74534842489.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/movofupin.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/56559383604.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614494d8b9ed5---webawiv.pdfIn PDF document text
    • 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_off0000eb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 18476 bytes
SHA-256: 182b2a7d3f2e9a72739f6dd198c118a679bb47e9ea6114b1996086635c8bbff5
font_01_sfnt_off00011bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAE 10760 bytes
SHA-256: 22d5e283976a9e8ea60e820af492c19a6a291f324a0c2a7ca845e3f5852fd5be
font_02_sfnt_off00013415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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