Malicious PDF — malware analysis report

Static analysis result for SHA-256 b066dc78af997970…

MALICIOUS

PDF

89.8 KB Created: 2021-10-08 22:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8c67ae9a30299a6c6db87d4fc2bd2d82 SHA-1: 536a31978fd68c3a7b74d65a0dc0c5293a7c214a SHA-256: b066dc78af99797010a0d6be055dd0cf309e94ecdbd208651f917a0f4256136e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that redirect to various domains, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to external, potentially malicious websites, consistent with phishing or malware distribution tactics.

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://infrive.ru/uplcv?utm_term=my+sweet+second+marriage+novel+pdf+free+download PDF link annotation
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/68615509919.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161339202a8bb1---furowadugusebe.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/jemiwolom.pdfIn PDF document text
    • https://bevillelecomte.com/ckfinder/userfiles/files/24317603023.pdfIn PDF document text
    • http://195exim.com/datas/files/jubawagarizevazolariwi.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/voxosefesajatuse.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/posugiwofavuvopixepogax.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/sexikizezurovowubovezaka.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/47668441783.pdfIn PDF document text
    • http://rld-carbon.ru/file/navexot.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/zigaxanarimusogilonu.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ba516c5b8f96ca1a8446551bd786189e/fafofitakeditaji.pdfIn PDF document text
    • https://webhosting4.net/media/file/gebutataguxupogadobedixud.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d749018c98---kupewunonutuk.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/rapubirowow.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/70384411897.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/xexefidifuzemem.pdfIn PDF document text
    • https://avela.md/userfiles/file/lukok.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210927_29D52633E5A87B45.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/makezemopajudurulama.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/46637457478.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/tipusif.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/91617c5177318b56eddc79db009cc244/jopexowokeg.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_off0000f0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BD 20068 bytes
SHA-256: 5660a3a7e65fd4d22c8914f32dd86bd2f1b01d0dfa7551e1c01beee0ebeea959
font_01_sfnt_off0001250c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D23 11220 bytes
SHA-256: d79531de468812122dbac4c64d6d23fe86b1ae451703633716106c1c9d19dee0