Malicious PDF — malware analysis report

Static analysis result for SHA-256 44785944c7ed8a71…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 15:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8a7604be7f2267f8a145e1cbc56efb2c SHA-1: 1a78a052bd2f573cb598c38455ba3c3298167d40 SHA-256: 44785944c7ed8a71a0db422767763a22201744c9b6222983f1eeb793600f5c14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=iphone+12+vs+s21+ultra PDF link annotation
    • http://cdwy028.com/uploadfile/file/20210907160002.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/86805066309.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/rurutagusokewasoze.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139db368e9fa---mafegilujaxep.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/poruxokogekub.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/85234350648.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/gexujenetamamovujinituk.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/nogurerapulizenas.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/8785403869.pdfIn PDF document text
    • http://rsentco.com/upload/file/fofij.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/85706029499.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/921fdc6272a0513d510f095ab05ecbf8/xefes.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/wubakerakolazoxawuk.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393e9622352---86497237313.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/97244979854.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2b6c63cb---rulozemekixorori.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ffc78791db04fcf12d2091675e6157b7/12750287140.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/zegixibesukiruluw.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f54a157bad---zojafile.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/besagugusot.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/xowimojomapew.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/bozetoxozemezunapazaluba.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/12952983580.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9E 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off0000e278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 10544 bytes
SHA-256: 4fa7bf33162e567533e089b5276a287745cf917ccbf13ab76f39d56d3cde3001
font_03_sfnt_off0000fa9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9D 17560 bytes
SHA-256: 021471ae461dc630de23cb4538752de10f5bc98475cebba03f7abefa212d0285

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