Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f67c273b2a25520…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 17:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d94d7f417efd3f0907609ea486ea864 SHA-1: 71d0f31d311f81142242896acf4b3a4a42b6e27e SHA-256: 5f67c273b2a25520080ffe8838e6dbc35a5041117677e41a4c38ad278d14f80e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users to external malicious sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://laborke.ru/uplcv?utm_term=are+snakes+cold+blooded+animals PDF link annotation
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/bff17816762dcb1e2e7add40c189976a/xaxanenonozotukuwako.pdfIn PDF document text
    • http://hainfelderteich.at/zenibogavetidaligupasox.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/49826856057.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d608ed1ecf---63224441008.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b6f9150b8f0e70ba71abef34fefc2d45/winozuvutijimex.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/594198469.pdfIn PDF document text
    • http://ecole.ru/text/images/file/nawajuketiwatodavabor.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5k042s91t2vkr1qi60gf29j4e5/lugebolaludibebiditones.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/bewijugub.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/salovamijefijidemedoxi.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/rixutuwef.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/29678065635.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vajijixodasidiboxijop.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160baa99444493---13530429789.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/zivuma.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9868b59d63540d966be2782e6785152e/gixolejitanoxipes.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/sfcmv3uohel200pn0fquskg0bg/daxigafutaziwogiserowij.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/miwumip.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/b78b6c2b33682b805ee6505c07344613/pagipozitowebotijozivi.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/26980668236.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/90922998050.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/65081075280.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_off0000df61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 10648 bytes
SHA-256: 753afa2231294874477db3903406b48203baf7d7a25809f1d718945f56e2d0df
font_02_sfnt_off00010fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCB 17444 bytes
SHA-256: 199750ad99995f85e9cdd346f551599c84d662a5f5a5e626c7a3b7f834d954bb

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