Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7be2f510543fc9…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 02:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8cdbb02471506fe05075ccba5730ffa6 SHA-1: 3298ef30daa12dc02236a94fa5d6fabc14e8e6dd SHA-256: eb7be2f510543fc9ac70bda9b23a0cf55894c501b9ed3fd23af506dbf0f1024f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://pakistanchristiancongress.org/userfiles/file/valebegas.pdf In PDF document text
    • https://magicdiscoradio.com/userfiles/file/86478299038.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/barevogupirewanezefekij.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/2414dab2b4941162dd648c0aa9c66fbc/miginezofasaxilukadu.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/9175779702.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7b3a229087ea4aa3b7ff55134e7623fd/momatupoxutepilulofubeg.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/todixagibelijewi.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/jajolabekeribulo.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/majakawesonefadebij.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6c82444a0---64242411058.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/sodedisadebamasut.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/f9788d882f0d708daca01910b690a7c3/palofedebokit.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/96582315187.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/71068211873.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/mogizolulivawas.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/66632466269.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/72960114476.pdfIn PDF document text
    • http://preprod-proximeo.com/ckfinder/userfiles/files/53493150517.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79512076101.pdfIn PDF document text
    • http://sireny.net/share/files/temamamalelewejipegawa.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/20231427465.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/gimasinowojexawivezevan.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/9974334519.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/5817368780.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/12108245496.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/dogogor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=stickman+archer+masterPDF 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_off0000b206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA18 15364 bytes
SHA-256: 2ce78666bb375b4aedbda3bd056f7d1a70713cb82ae5a3032f6f37b6f270bf30
font_02_sfnt_off0000f11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11F 10496 bytes
SHA-256: 02ad112c921a189abd8aad2c46ceadf3e180db036f517bd6daf58c8cfcac52e1