Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0e38a4e91f91d8…

MALICIOUS

PDF

87.0 KB Created: 2021-07-04 05:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dd31e1b2841770ab451f6e7f80290dee SHA-1: c0e7ec800e4acb3e4a049dac46892603e6ca4a91 SHA-256: 4d0e38a4e91f91d8152c34ef3736475b34415fc074faee8d3386d9fe774d9f5a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a phishing or malware distribution scheme. ClamAV detection and ML classification strongly suggest malicious intent. The document body is heavily obfuscated, but the heuristics point to a link farm designed to redirect users to potentially malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16098432844814---sowapef.pdf In PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c86437f243ba9ca2866cccfc6eb80dcb/xoxasav.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/5928739138.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/defosonenokitizidete.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/28303702221.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608281d53b0d9---65525202275.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/68066432860.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/nikiviritetubunisitasok.pdfIn PDF document text
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/lokepumur.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/wujozavafameve.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990ccbdc028---femota.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/xuxukevixuzigima.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/kadumirukikolozalax.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3cd49861302eb411de042e19367638d9/18671899481.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f1dad0553222f415aedcf62e544d319d/sipujirezixujogoxepexe.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/73614252183.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/kodutavozomipi.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210629141925.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b55d10480fb---rozit.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/14171789139.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/ecbf0702c161af4e2ce66d9e8520222a/75792344225.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c986798162---71072193162.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/8b49fa1b2a0c1669ea76e5833689d3a5/gotiwedivugogepadil.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8116b21d8d1e5c0ce32dfc577a7905cc/logob.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/aa01f9a19ba886fc049e5cca3de13ce7/sufabazagolulegogobipusi.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/gmor2gjk3h7l1pi3uqiu112617/37195846463.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/tbld66qhoc88lp58hftjuu30ul/rudobesukodurujaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=2012+cvo+for+salePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001099d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099D 10300 bytes
SHA-256: 1ead7f4fab2b77bd6a38efdd6501e52d63bca15f717fc1488fe61abd161a5788
font_02_sfnt_off00012115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12115 17524 bytes
SHA-256: a28db4737d24c56993d038c1d8ee199ea613e93177ff992ee91fa28d4241a448

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