Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bb8f17725d320d…

MALICIOUS

PDF

91.5 KB Created: 2021-07-07 17:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dff12aabc466c36d4d9b80f44c4c3299 SHA-1: a2fa0c705edcf9470594428cdc7b25f1be583db2 SHA-256: 98bb8f17725d320d80aef30da4734af2b4d338f3a7e36a9f032ee168adce6e35
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The presence of numerous unknown URLs further supports this assessment.

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 http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fe0636da6---66267120092.pdf In PDF document text
    • https://infiniteprospects.com/FCKeditor/file/zogivuxokaxusovazid.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089ff8e7e935---gorodebavafifu.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/7557705229ced7b161899d8c5f8e59ba/1394978932.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/tivezusigadepeliwobokuzu.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794ac9b9098---jojorakuraxok.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/9cdd50fd530ddb8270e4d3ca86c5db61/89402411399.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/aafb478262d83fd1a10c5d51682ca05b/wikavijasovupuxemimed.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f396da49a---53282900075.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/b5ecbd4b88bcee4fee5b47f617dbf667/14307327923.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/97513523864.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d280f5dd20---zidevofipariposafem.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/50798866288.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/69308465671.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/wesex.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/bicvifabo6v379set2rrsaagsi/fulola.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cae98bb3867---waxirivasoritokovelew.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/57300877045.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/sawezi.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/8u8nsicri1pb5fl2hbauckoa99/56164741593.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4374ecc63809bf3175f991f78f2321b0/38614582289.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/trncg73k9f7b6h0uve5uppk2ea/53420267001.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/zuwugagonakigitewula.pdfIn PDF document text
    • http://allycatering.com/userfiles/jakelagirebituzemebewe.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/21266471618.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/3189746393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=quotes+sky+and+lovePDF 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_off000103f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F6 10480 bytes
SHA-256: 99bd6d6a55cf61f90b72bf530e79746670083648ef5e73992fee28fa2210a1c7
font_01_sfnt_off00011c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13435 17404 bytes
SHA-256: 31851659dc300fa56a0cb0daa87ce255266ea92a7521f58c161034a3ebe163be