Malicious PDF — malware analysis report

Static analysis result for SHA-256 833e7aa82274e415…

MALICIOUS

PDF

85.1 KB Created: 2021-10-12 03:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 129a7af53d0cd6ec71f4d9b3464849bc SHA-1: c533e08618ce215ff626e21fa765a24a27ad1390 SHA-256: 833e7aa82274e4158b1d95c9437606dcadcb0e39a755feccd2cbe11de6b20802
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/73a289ef0ba16c6d1504fe7697569b23/19874629479.pdf In PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210915122446.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/75830131220.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/9276023077.pdfIn PDF document text
    • http://sd-bada.yupucx.com/upFile/file///ITX202110112256034681.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/9094285679.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/jakogubexiratuvozeg.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16158ec3235c97---23325092647.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/99660923168.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/tolususavefume.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/86749461013.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615fd8905fc2a---rakukuvomiruduvurab.pdfIn PDF document text
    • http://med-os.com/user_upload/file/31453700813.pdfIn PDF document text
    • http://licausi.it/userfiles/files/7597083954.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161568ba040713---wojadalogonukukapod.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/gugepimudokudimobew.pdfIn PDF document text
    • http://benly-carson.com/product/files/89908059945.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/50822070956.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/tedirosezatujugusogap.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/jiwaxunetamuvadofetupum.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/vinid.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/49993010304.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/wivuxidijo.pdfIn PDF document text
    • https://qematalsihha.com/ckfinder/userfiles/files/42716813887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/TxADE9PCSUw/uplcv?utm_term=watch+adventure+time+online+free+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_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 11244 bytes
SHA-256: 6778c769a1e90a324c4af7a2924a147b6b4877caf8cd238910066301a0a8c16e
font_01_sfnt_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 18756 bytes
SHA-256: 0ceaf02ed30409c072650f38c079f7fcbf0afe37b738fb0195d3b3d895df8a2f
font_02_sfnt_off00012e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1