Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a8fb7f42b4d490…

MALICIOUS

PDF

96.6 KB Created: 2021-07-13 08:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 380d4be677e7d04cfccc0d29731ec9d3 SHA-1: bc54375a667e7c0fe7fbf8102412b28710d8f7ec SHA-256: 84a8fb7f42b4d4909fb64bfdc699a7dedfccbc159255c4d7cba582d9e95ef03f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious or phishing sites, leveraging the PDF as a lure. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9486

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=subject+verb+concord+for+class+9 PDF link annotation
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6a6e484a9---4627639202.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/i2khm5prnakh8q6t9u7a1r5s0r/1189635602.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/38f9ceaba194ddf94aa5c39cc43b6302/36126900348.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/fokitotixividu.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/nijolenaxapofuxigazotix.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/85168298319.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609afb61c93bc---lobinububemotemunowuwinu.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/31908496206.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/97c6db8ca15861abcd8c670a774895a2/luvemas.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/luremadokavutatitadag.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/38100912359.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771d20cba9a---ratetanom.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160784e1e56795---zuvab.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb92f639ca---ginanepafamunufu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c35a6c6ef---zegudaxu.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/tijibatutizoju.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/kuludaludefomowuk.pdfIn PDF document text
    • https://digireg.dk/upload/lebaribonivel.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/86841810870.pdfIn PDF document text
    • http://prestopc.it/upload/file/56752602681.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/punuzusiwasetizupujamij.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/tozivoxonumeredavetab.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/035e0b24c8fce6afd55a15661f6de816/55995559904.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2cc2ced78---57616342535.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/55083203117.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/dff557b00a5b23938ca3bb740374eece/zakibuw.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8D 19312 bytes
SHA-256: 1b2c8603351afe856c8407aae7106c00c4648c3ea24f4d4d1ce1994f353b23b8
font_01_sfnt_off00011c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C89 11056 bytes
SHA-256: ef583c8fa511f445dfea321c8b8e6e7355b8918fbdef93507c99df1dbd09ebc9
font_02_sfnt_off0001367e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367E 3808 bytes
SHA-256: 0f820377abc9ff0f975f80acca407bf22b560ddac5db44eb10a3c452d4c003d8
font_03_sfnt_off0001456d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1456D 16328 bytes
SHA-256: 0f63c3b9fcef73c42961cbd20bc891915e13c5f07365be08e18618425efb6209
font_04_sfnt_off00015bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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