Malicious PDF — malware analysis report

Static analysis result for SHA-256 7445a6b4c2676093…

MALICIOUS

PDF

95.6 KB Created: 2021-08-05 12:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e9ba3ff77e7360d9e5fcfdb3c7caf7a0 SHA-1: 5ae62ac61f5588d8e42ed78d96b02cd9d812ffab SHA-256: 7445a6b4c26760939e211e63ee263f5832d35e5e82395ece0284533e33db0e0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are likely used for SEO poisoning or to direct users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://crewmak.ru/uplcv?utm_term=free+printable+feeling+faces+cards PDF link annotation
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ade61dedc44---65271531206.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/83194975759.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/wawuwirevukuxigatam.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607a771d83df4---ligalugapekapojulala.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/47948773368.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a4fbb5dd---82978612954.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/hsjdgjcf652ems6cb58a3k5na1/34347207229.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/44954800053.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/14126740090.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/73545129962.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/10007583571.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/75963513867.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/zuvixerisenutaba.pdfIn PDF document text
    • http://soupworld.de/upload/file/61476720444.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/sujosomafaro.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/okb3782vbd8pmga675ji1voeh3/53602778090.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786b437a906---86997920014.pdfIn PDF document text
    • https://btegypt.com/file/49455839712.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/pufulawodigiji.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/zobuwedad.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ebasgu5ci83b2milusuom6e6i3/kewezeto.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/dc2d58769e78c97aade65c8cfda35bfb/89780850829.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/19236784775.pdfIn PDF document text
    • https://x-software.cz/data/file/45104037681.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_off0001123a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123A 10792 bytes
SHA-256: 4652a788cbb5598e2ac18f20d76a23b8205e2876a47e7f0e4135ed7052ca912c
font_01_sfnt_off00012ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB8 17684 bytes
SHA-256: 06df3d706d7d0c3179a8e53fb7a811d3bfb26aececcab87715b5a561553c293f
font_02_sfnt_off00015785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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