Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a5fec02a23bb74…

MALICIOUS

PDF

79.2 KB Created: 2021-07-18 08:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5960911e363c42954be7161025a4f8a4 SHA-1: 1ca079bba1ea6a206653677c39daed540e1a3984 SHA-256: f4a5fec02a23bb74a3b3f11396706ee26e1cb035bac14f05ceafb27d75cf9aa6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress installations or other potentially untrustworthy domains. The ClamAV detection of 'Pdf.Phishing.Trojan' further supports its malicious nature, indicating a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089976828a49---77529107158.pdf
    • http://ztkammer.at/uploads/file/80952472023.pdf
    • http://buchtel1967.com/clients/26382/File/dekodaravivikiwu.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a21fa55da---99827401507.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/fodagumip.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160abb5ec027f3---nuxoliwivizilevoxovumid.pdf
    • http://fairway.cc/images/blog//file/56555534406.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608785e6af7b7---84147420979.pdf
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/nazorupamegijilo.pdf
    • http://rogersdesignhouse.com/uploads/files/58966570724.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5e9376019486db2963fe57d009852207/gigezigufam.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f9b16deeb---33848379948.pdf
    • http://alumcity.ru/userfiles/file/padafimodi.pdf
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/nekesakiwijosezibubatu.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/9m8ni29o40hbvaatu4nnkaf3c3/75415233913.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a378b953ff---pulapetezegovijire.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/14041212c80dcc3c08d1f2e2a411ad51/nexuzaximazepukom.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/09cb4552478da2966b787a4b3e449191/xitokosisovujibutonowo.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084952918f18---gerekepiv.pdf
    • https://monamifrance.com/FileData/ckfinder/files/20210620_47893D81C82B5BD2.pdf
    • https://7gking.tw/upload/files/25978621034.pdf
    • https://fnb-concepts.com/images/uploads/files/pevejijuwurede.pdf
    • http://websurin.net/UserFiles/File/13650341782.pdf
    • https://kawanmto.net/contents//files/tajimivimufofapu.pdf
    • http://fatamorgana.fr/uploads/assets/file/5065850252.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+words+to+green+eggs+and+ham
    • 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_off0000d23f.bin
3186d4e75320bd9b852c674df18bfee89ede53fa22b506f1ef4a43a103de74af
pdf-font-stream PDF embedded font (sfnt) at offset 0xD23F 10604 bytes
font_01_sfnt_off0000ea2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 16792 bytes
font_02_sfnt_off00010241.bin
fb8fbc37a030e0521f1d317fa137da957f66150cb5af2f2d893086fb23eda996
pdf-font-stream PDF embedded font (sfnt) at offset 0x10241 17432 bytes