Malicious PDF — malware analysis report

Static analysis result for SHA-256 742aeeecec6d7772…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 10:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecb69f52f1dd2f22c06b5b58f00f75d5 SHA-1: 2e919fa2dbf773795f826da5b2e5f68bef054131 SHA-256: 742aeeecec6d7772015296926858e54bdfbee839e8f29d7bfc7fadab08ccb383
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware. While no scripts were explicitly extracted, the nature of the link farm and the PDF structure points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://4998horo.gmmwireless.com/contents/files/48628351445.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-9-4/20210904150416201008.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609df8594a804---rorafupedupitigore.pdf
    • http://www.aadhar-interior.com/userfiles/file/11676635746.pdf
    • https://twr1115.net/files/fckeditor/file/zafipafunenojurelugox.pdf
    • https://dadesigning.com/daduserfiles/files/nevazowixekofu.pdf
    • https://kompaspt1.com/contents//files/jegegoduzadaluxabuxafugud.pdf
    • https://batikatravels.com/userfiles/file/96027150247.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a977ff99b95---32702497525.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b32595aac7e---84302128473.pdf
    • http://myexamadvisor.com/fck_uploads/files/muweluge.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c57792eb91f---vusemonuvufud.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/885iru25pm0qr7navk87el6qek/3133495008.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7d23a51ae---23604939002.pdf
    • http://phayaotechno.com/UserFiles/File/45394408496.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b815a2dde---maropixemofirorepijirumus.pdf
    • http://abwingssuffolk2.com/uploads/files/bifezikufitelitero.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e6dec988e---17924694773.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160bea3151a213---gaxagekuk.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/iib9m44k331ambj749284u2lj3/24785683991.pdf
    • https://eternalbliss.net/file/kazut.pdf
    • https://advik.net/userfiles/file/25859632808.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b284afa7e8c---57829452932.pdf
    • http://jtour.vn/userfiles/file/70007241823.pdf
    • http://roocenter.ru/upload/file/81615973092.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ak+sawhney+instrumentation+and+measurement+book+pdf
    • 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_off0000cfb1.bin
b2ec129443136d1b7b0340830900a43f6559d7e331b869f4eca14059db2b7dfb
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB1 11228 bytes
font_01_sfnt_off0000e9b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B5 16792 bytes
font_02_sfnt_off000101c7.bin
7cd565ac76a132cd9378239c3ff0cf3c2b080e80c50e03d8c0cb40a93f8f7b96
pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 17880 bytes