Malicious PDF — malware analysis report

Static analysis result for SHA-256 283bb60f419103ce…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 10:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 024715653fee5753efda034291eb6332 SHA-1: 4acf17144c8a4ed0747eda61bcce8870964061cb SHA-256: 283bb60f419103ce181781f37e70fb2c8dd9978cc27c53c305bfbd51933f5f93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cructi.ru/uplcv?utm_term=candy+go+107+df+user+manual PDF link annotation
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/njvguetnlakprqfj4m9tukrk20/94298523635.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608248c87d071---rejorukurovobar.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/9113500896.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/4337214658.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f98db4179---18207915912.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/53541073283.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/lc3chhj2efurecfncfadhhgv4j/76829967576.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/kixojudes.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/68725440400.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160bd96feb371b---74276673172.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160937ce6df7f4---nesolojazufozexotave.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/69142a9891354d07778c0aab401e30fb/lenapejutep.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/puvowet.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cee7089067a---faluladep.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/ee7a4fbbc0acd0f4e77f9591c75c9bb5/75521998901.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/73d423764576a670fe2c43c9492d6b11/ruxupanakesirizufeg.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/nekamuvudulunipovizubokef.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/nenapulanu.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/nepigagiseradex.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/pumijotobijilufa.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/2c0ojm5gn04p42fclqkf4ks037/dotepoxevunefix.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/8r9vrsort6ia4la7vf5j7gu23d/36544970903.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/17835942764.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/58088658491.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/b80a0ab9bd1cc24005e03d657be1b3cb/24043458924.pdfIn PDF document text
    • 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_off0000d7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 18252 bytes
SHA-256: 48c3537a7f4878953bb884ade337269b41679522e4a1430f897bf83147b86487
font_02_sfnt_off00011f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F32 10976 bytes
SHA-256: 22182831b2d295842ff226285e49dde3fda3e7690bc47aec05f7855e58b53d5c