Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ab470ffd5d0e00…

MALICIOUS

PDF

105.8 KB Created: 2021-07-10 11:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 538c5c9f3cc45d7d3c162b1dc58c488e SHA-1: 6f32cb531abd0bba2d70c7995994d482508df8d7 SHA-256: 31ab470ffd5d0e0044cd47586a8c7e11d095b99b3ef545e10e754c0b50c4575b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that contains a link farm pointing to numerous URLs, many of which are hosted on compromised websites. The heuristic 'SE_INVOICE_LURE' suggests a phishing pretext, likely to trick users into downloading further malicious content. While no scripts were directly extracted, the presence of numerous external links and the ML classification indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://luyenthitoeic.info/userfiles/file/58706934540.pdf In PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/59da0f084eb00e79de366d419db0c0b9/11107482542.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/7113821229.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/domipi.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/jatatorofevuru.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/79884092200.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a67f9e09898---25602454203.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f056d9b4e45a21ccc365a90aeafaa6fa/dosudakogibavutegakuwe.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/92356212336.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/7o918qdd3uq9hde6lkf9pe7fo5/19850512433.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/porixugitid.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/20730784840.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/tmfr5jaq8pses4re116dehnmk8/wuzuf.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57b80ee704---xapukeguxatunilus.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b31b5aa90b---12796186967.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/18ad8ebf3cc0f5b1c9adc97a10c9d703/jebinakarorasusud.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/q16ceqt7i9l0nb7c9c9fo4e0t2/29847648913.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ruh6ir8q5s9fj3v35h629cetmp/letide.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/g89uednbo65kkdd4riahh23je3/tebadojesovaduzore.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce1166d352---govapopojilokibetodej.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/0a9826de25f8cb7a5a8296c2f4789840/35012916680.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/abjmukn77nk2uoh3r1ttmousqu/86461191436.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091126f01322---venul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=yugioh+legacy+of+the+duelist+best+deck+2019PDF 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_off000135df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DF 17976 bytes
SHA-256: 8d3287a68b3728ba57218c80fa91f7e2c331bc81a401e2afd8770bb2a471f128
font_01_sfnt_off000164a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CC0 11440 bytes
SHA-256: b00d817e7b68349184f87a5143ae60ee4028c2de002ab63e4ad7ae4f24422963

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