Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe73973c9ccee141…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 16:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a9e9b99fcc29dde86989faf57df48e42 SHA-1: 5eb04c0b3c319c938f33bbbb5815eac0052a615d SHA-256: fe73973c9ccee141e6814458df0d56a65ea3c981508e7847e2a95c47746b0f1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics as a link farm and a phishing/trojan. It contains numerous links pointing to compromised websites, suggesting an intent to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4jpdm2p3r8or0tc86p6qiggbd4/likibom.pdf In PDF document text
    • http://luatsubienhoa.com/upload/ck/files/61234441861.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/6867317890.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/mamidofenapuxeporow.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/vitazovuwozuf.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/muvenemifafu.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/gudarikinarukolotog.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e52fb2658---81815531163.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/56f8cfb0db3b62c5a5e8b38f979a39f3/beraxoduxedu.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/21/file/wirovatobogeridudit.pdfIn PDF document text
    • https://hirurgija.me/files/84409498049.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/40742634852.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/mejefikikirelevopupiw.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/kozezosaburabudu.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/gupixiz.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/lisonefexopamawireba.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d191940fb4---bokulafusilepezuziw.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/9080193990.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d7f7f2897---17698387670.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d33b155bef0185a6d285c5902b2a16b1/vifaguvajox.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/945410e29164e8356a627d271b9b43e6/zumiritepesojizuk.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/86015437160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=economics+of+labour+and+industry+pdfPDF 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_off0000d988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD988 17856 bytes
SHA-256: 016f151ab40271e6b6cb8000e73293e453cf93c897ce4b72bf3b4b61c90d9f59
font_01_sfnt_off0001071d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F34 10984 bytes
SHA-256: ce4afddec6cb148aa192eeda6c1f8cbea62fb9d775aa5d2e585132ba7cf1b921

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