Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ac6dceb7133527…

MALICIOUS

PDF

91.2 KB Created: 2021-07-19 06:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 720d26d408c48f2ce1c34d7749d6c3bc SHA-1: e7195ad4e1b204200ab75111f1f6ff7ee1490a6e SHA-256: 34ac6dceb7133527b309864523f9dab1ed35b1a77c14a10e88b3dca5850c2a67
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many of which point to compromised CMS upload directories hosting other PDFs. The ClamAV detection and ML classifier strongly indicate maliciousness, likely for phishing or malware distribution. The sample's structure and URL patterns suggest it is part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/726bd58f21e01ec761ed65e2cf4bc1ad/nipepizafox.pdf In PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/59bc65a866a02f651e41ab1d93cbcce4/jidavexaxunuxoniwu.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/depopolixutusogugosij.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/rufosivabasupe.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/httos70avlcs5ac277kv7mmies/15258116448.pdfIn PDF document text
    • http://gyobel.itpublic/file/10532148081.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/25082691475.pdfIn PDF document text
    • https://tavio.ru/files/file/najiv.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/1586ab667ec6a88aea61a220a8080a0a/48076561156.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/77082898204.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/3576973335.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e6ad48c44---48767922922.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/frnsr7rr6mdpth3jdscni9nmjc/52768522323.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe89692f3a---ladonudofobegosasol.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/falurefakolaziba.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/zexatesepine.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/supipug.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/c55cb51d9d2ecfec107eca3af5823a2b/kakenasinekevijuj.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/dd7d61a93cc7d95a2628d3085ec6d8d6/wemukajine.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160886fbb7545f---72916814170.pdfIn PDF document text
    • http://vodnik48.ru/content/file/vakigugarodejudux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+switch+hands+minecraftPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001170b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170B 10772 bytes
SHA-256: 629f85fb84bfcd79a14e634aad6336f5578725d47507b3f62df3a667b1c3cd13
font_02_sfnt_off00012fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA9 18084 bytes
SHA-256: aa5773768bba3fc3e48726554c3a329bb766421c18fffeae120f927a33868084

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