Malicious PDF — malware analysis report

Static analysis result for SHA-256 154a074ca796ba83…

MALICIOUS

PDF

68.7 KB Created: 2021-09-04 05:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d1b951a5d4adb2b0666449a732c03da SHA-1: e73cb7ddd77443e3c0224ca0bfd041ea5872bc57 SHA-256: 154a074ca796ba8365b311957279f79fb225ee21cfd464f2854af35f61070868
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, utilizing an image-only design with a clickable action to redirect users to external URLs. Several heuristics indicate the presence of links to potentially compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://leaguengn.com/userfiles/file///78650549127.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bbff82ad759c2d21db6ec14c01181a52/36153171387.pdf
    • http://maxbrio.kr/files/files/7074925881.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ea1d45fc7d4990235972b0fc1cba75a7/bekud.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/6d881d709475a79009400b7bce9183e1/49303338237.pdf
    • https://daxitrip.com/basefile/daxitripcom/files/57316029155.pdf
    • http://irk-yoga.ru/upload/files/fozeminikiso.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7eab36de3---65792595382.pdf
    • http://jrpst.pl/userfiles/file/loludefejimi.pdf
    • http://dok-vo.ru/userfiles/file/43719035658.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160807c190af4c---bebugipobutudoje.pdf
    • http://www.tekkoo.net/images/library/File/fizadizelilotewuzusipepa.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9d95e52c5---zupowazomid.pdf
    • http://kokocurry.gm/userfiles/file/fazez.pdf
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/lufanudujapebuvigopune.pdf
    • http://caydinhlang.net/userfiles/image/file/mawafopevojazakidezim.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16101175d8b3e7---tanana.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/41c926624bef5bfc726074e26a27c5da/56960458485.pdf
    • https://yp05.com/_UploadFile/Images/file/15810478714.pdf
    • https://anduong-nhatthanh.com/uploads/news_file/pugofanevimijoj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=vedic+mathematics+pdf+book
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b264.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB264 16792 bytes
font_01_sfnt_off0000ca76.bin
2aefba4d90d68921c14e9d1ea9524846dcf133e41902f5855559dcb4e9c5e3c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA76 13928 bytes
font_02_sfnt_off0000ec9f.bin
13bd6eac667badd550fcda79713fbd3d4026f9a00002107ad4d49ab067d5759a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 10836 bytes