Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac72fb361a6c63c…

MALICIOUS

PDF

76.7 KB Created: 2021-09-01 10:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7b559ecbb1ceb4246e9ab4ad322e3409 SHA-1: 9b5380731547eb88377ebee263fae7d189e5e115 SHA-256: fac72fb361a6c63cebce79084e12d8361c157fb2d1523993d8a9279e292a9f3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://huntic.ru/uplcv?utm_term=south+african+learners+licence+test+questions+and+answers PDF link annotation
    • http://grafichesirio.com/userfiles/files/nekefinel.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/7990356331.pdfIn PDF document text
    • http://sushi-belovo.ru/files/74922833246.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/15338783690.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75563418192.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/837b7e4e30894776bc3350637c31b7eb/dumiwen.pdfIn PDF document text
    • http://usateatop.com/_upload/files/gixowozuwilomu.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/855bcd622da835a766d7699513d075bf/61848799937.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085af3fb2295---63198448510.pdfIn PDF document text
    • https://shinaltd.ru/images/file/90438324948.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fe6f8ada85---95806453194.pdfIn PDF document text
    • http://huiking.cn/uploads/file/290635313371.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c1867018cc1---88734589340.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/wuginarinokise.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/84314014051.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/cd2a33a8e8eca14b5f3d8c8f7e3744aa/viwimosetula.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893daed8fa1---kadaperevu.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ugu0j2eqqp2j454hq5bi7p1k86/pofaku.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16202319745155.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/2e8989919fc2d5fdb8ffd73445c9fea0/bexolunitezowureb.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/malukelejuvolotuw.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/71693203286.pdfIn PDF document text
    • https://ahha.az/userfiles/file/zujumusitajefu.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_off0000c67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8E 17120 bytes
SHA-256: c035f6db8563d3434a4d24815d1104d99cc8f9f8c23273d086a54c27857d9885
font_02_sfnt_off00010ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB1 10980 bytes
SHA-256: d9d4837146a55757465394db267178cc13a463232a02df8b3dd8854195ae9a99

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