Malicious PDF — malware analysis report

Static analysis result for SHA-256 e771181e7aa60604…

MALICIOUS

PDF

87.0 KB Created: 2021-09-21 03:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5a934e2ff00464e0025a417c11ebcb7e SHA-1: 05b75d6790353a80cfcce86c7a32fc4e5877b50d SHA-256: e771181e7aa60604ef5d51e9fdd1a7ffe22340c1d7c88e2c306e29b9ab5c4792
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malware or lead to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://paraglider24.de/pics/fotos/1/file/jufotunusi.pdf In PDF document text
    • http://jyotiacademicpress.org/uploads/file/supuvujimi.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/45471227825.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/38998501622.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/zunupebebefofa.pdfIn PDF document text
    • http://kd-council.com/upfile/files/sixewoze.pdfIn PDF document text
    • http://grupophi.es/uploads/files/tefosixopezunupoziw.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/91442149692.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/jexaxujolubib.pdfIn PDF document text
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/visavekikemamow.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/68425718808.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffae76732c---59659241713.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/79403392615.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/fubidugunalekuduberetod.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/muwel.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/pezurosedivoxuko.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/pitazofatekopavanutag.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/93217543060.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408d27f221b---rigowopig.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/37814895281.pdfIn PDF document text
    • http://alvitraders.com/files/78195008076.pdfIn PDF document text
    • https://synersys.fr/contenu/file/notubagisanap.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/8456e6d53174ec230cdcce910a22ef68/78134895537.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/69725850989.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/nixomepomanazowobedutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=never+talk+to+strangers+full+movie+123moviesPDF 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_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 17356 bytes
SHA-256: e85f18d82db60b869710fd3931c79604b78c2b23894a69c437fd78a06472b417
font_01_sfnt_off00011bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF7 11136 bytes
SHA-256: f2dd9a71c1b8353b5e0718a77ade67326a2d41e338aa46228b77081dbd0cb768
font_02_sfnt_off00013620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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