Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5fd7ea82aeadc2…

MALICIOUS

PDF

85.1 KB Created: 2021-08-05 10:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fe34c461c54c83a0ab6329443bdc571e SHA-1: 506ce32822fbf21799e381a8b81a31a80ddee2d6 SHA-256: 1c5fd7ea82aeadc210effd339b2733c8bf1a069ca60d7dc7da491272334f318a
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and embedded URIs are indicative of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cafemsoffice.com/userfiles/files/wetoxubivexonomuv.pdf In PDF document text
    • http://tycoonmedical.com/userfiles/file/64129050263.pdfIn PDF document text
    • http://aplus.to/userfiles/file/jirope.pdfIn PDF document text
    • http://henca.com/files/details/file/xemabemexutogugewidape.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd72a4be78---zipevok.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64134a1d6f---sugutiliseviwup.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd60be3eee---84182316918.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfe4da4ea7---kivezirasogovizagimogexa.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/turilolowipujazibirute.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/wewibeweverogadefu.pdfIn PDF document text
    • https://signika.pl/Upload/file/lifavomivigidamufoguzif.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/nuxazevaxinituvawozirir.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/sawazofapovovakojirujux.pdfIn PDF document text
    • http://strandedtattoo.net/file/36256522884.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///27549934761.pdfIn PDF document text
    • https://digireg.org/upload/sukip.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/matujazilibologuvetimot.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160f9f86c8ca73---63936013060.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/mikatarelejanexevukat.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c33c16e83---90098146136.pdfPDF link annotation
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/q0a5o6dgbhu8p8e98bc23ijr0o/69392009415.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/mimitukudoga.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160811ceb621ba---46063769444.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/dizajujolepanatoxubapolu.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5aeb33804---45945982772.pdfIn PDF document text
    • http://quinta.cl/upload/files/lezejasumubegobodalev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=buku+esps+matematika+kelas+5+kurikulum+2013+pdfPDF 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_off0000eb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 15524 bytes
SHA-256: 3419f86ad5f679d4cb48a140831a296422bd4042f1b3b7c72c83f3231d9212a0
font_01_sfnt_off00011337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11337 11280 bytes
SHA-256: 1fcdd8ad5277998b900423806c6adcec0801d62aa3e03420b67dce1ee2ca6c0e
font_02_sfnt_off00012df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1