Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f18b1526ab9d9f…

MALICIOUS

PDF

79.7 KB Created: 2021-08-29 02:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a3951774146fb56546215b14372b1e4 SHA-1: dbcb0711fc1949e347043bffd47bab0e113e48be SHA-256: 84f18b1526ab9d9fcb090d545b08467740176bff2a1c3c0aa6cdc775134ae306
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d4a057680b5b42cf3541bdd68c7627f9/limifekizabanubinetojuk.pdf In PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/1aa36d6e43d80a979d646ac5cbfe48ee/muvutajatapiwadajon.pdfIn PDF document text
    • http://0851gay.org/userfiles/202107file/2021072421562870554.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/63216999136.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/xuralaselekaxokulexakenit.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/rumibifapu.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/40958373293.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/munur.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/44380011643.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/78091693535.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/mafijokaz.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7983fdcf63---webokubox.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/dovivosonofixagadiwak.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e6d4b83f---85592280062.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4d07d336c4188622a0f31949a674c650/48087265822.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/4mtudt5mg6a4aus3cqfsnff484/52059147035.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6f8e9b3e6---71256968231.pdfIn PDF document text
    • http://onlinevay.com/upload/files/jijamujumeme.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16116bdc425951---miwasoxoboda.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9a6dd69bc921213bac6b75d30dc22458/wowaxema.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a675be25ee2---rekofalaforelufopod.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c70245e80---76109651587.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607455fdaa0d8---medejimo.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210627023827_kx6hy6.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb3d0d5aaca---nopakuseruvokix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=atoms+of+elementsPDF 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_off0000d776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 10000 bytes
SHA-256: d9f5e548632ca997cf71306ce8ebcfd292fffd58999fe8fbde821e5e0c166abe
font_01_sfnt_off0000edac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAC 16648 bytes
SHA-256: f4ef19de20debc8851f9e403bf7f87dacf829cabde54afaa6bdd48a280a9669f
font_02_sfnt_off0001186e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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