Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df2fe28776b85c9…

MALICIOUS

PDF

83.6 KB Created: 2021-08-30 14:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 689899bd6aae7b55be81133ca8073915 SHA-1: 8e26ae08903fd1154806b13e8d1733ccd4d3eafd SHA-256: 7df2fe28776b85c9bb2728eebbf1831e77bebf1232db796bf2052d4cd96de6e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The presence of multiple distinct hosts and the use of disposable hosting suggest an attempt to obscure the ultimate destination of the redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/0130ef697c366d389eee024cbea9c35b/sifanot.pdf In PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/41611326464.pdfIn PDF document text
    • http://355353.ru/userfiles/file/dibozuniwegilen.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d05529b790c---80640556279.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/15ubejqm851v4jljs3ihocv7nk/lavibolowuposadojenikano.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/4r7hg2u6bv700gr2pnm3hjpifj/xaxujizenubegofim.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/84052106296.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fb63a5ae---36110565869.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/pidap.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/jipavarakubivujuvavinubew.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/vi940okbmg3e2kdrf3t9d82171/41206275799.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/34107687971.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/kinepaverezijajepowimina.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/zoxetupemosodoxep.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/bonidurevadixisomobiguluj.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/5015917560.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/madazogijikomeva.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/24925749176.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48dd674b4a---56927820074.pdfIn PDF document text
    • http://elitk.ru/_files/gugamaxubupulax.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c16cc620eb2---76851635492.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/54807015138.pdfIn PDF document text
    • http://farmina.ru/uploads/files/zatijosasiw.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/a2cfc8b8fb07664709c75022cf79814b/83244621291.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/70609120983.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c6019f574---rigujijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+of+crowdsPDF 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_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 10120 bytes
SHA-256: 2fb8213ac9efdc1ca80cb3e84e809d57ee3f55eaaafc1b4ed59cbfb2b37db595
font_01_sfnt_off0000f771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF771 18248 bytes
SHA-256: a268bbe6b3bd3ca2404526018837a777c007e920ff49cc163445487ebf09cf0c
font_02_sfnt_off000126d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1