Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed5c4bc76a5dee1…

MALICIOUS

PDF

78.3 KB Created: 2021-09-11 18:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0164ccab6452bab3fde525ba1acf7d16 SHA-1: c220398a9eb3849138ecf6dce8c24cdee4c91387 SHA-256: 6ed5c4bc76a5dee1c06c706b3d9adbde3939dbeded0fcd58445d81179f22265f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of 'utm_term=pikashow+apk+pc' in one URL suggests a potential lure related to software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://qwert5.com/psum/admin/userfiles/file/kozuj.pdf In PDF document text
    • http://elrey-uslugi.ru/media/file/48518658630.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210907120025_1996313013.pdfIn PDF document text
    • http://air-con.ru/upload/files/37653407886.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210911133254.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/jekawo.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/16658524273.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/9569489793.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210902_7135A95DD2ADB9F4.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/58400508498.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/regokotapugurun.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/febogekezaxi.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/zutofinosuwaranigazadis.pdfIn PDF document text
    • https://media-get.com/userfiles/files/tinefamonekorudabaral.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/vutigifaxilila.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132001789db4---33488019809.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/54158626571.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/57847189258.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/44776587754.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/gefigedetedodibuxudemo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312af16a454---77490503854.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/10b287031d5aaeff5c878468f6c2db1e/7196340360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=pikashow+apk+pcPDF 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_off0000cf79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF79 10172 bytes
SHA-256: 04fcbc8c2020078aa07f64026f604bed81f07eb27a1e0fe199496979aa7aa243
font_01_sfnt_off0000e674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE86 17600 bytes
SHA-256: 22c6b933bc7ede15ee9e32988e7497f0fcb3d2fe0df4fda0f57c3e904af48a6b