Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c306269bc1684ce…

MALICIOUS

PDF

91.6 KB Created: 2021-08-05 17:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 398ad8da5c10b99c77326968389614d0 SHA-1: 8077e72441a32239a768e416c476ac143eeeaeb1 SHA-256: 6c306269bc1684ce96ae5a10fa6395da624d5eade02524256aca60dcc6be1165
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised WordPress installations. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests an attempt to manipulate search engine results or distribute malicious content through a network of disposable links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://laborke.ru/uplcv?utm_term=examen+de+quinto+grado+segundo+bimestre+contestado PDF link annotation
    • https://mfdesign.hu/files/file/82719614800.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lizilawe.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3200c0b9cf445fe6a0d8dd2f8fa44cae/liviteb.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab71e0b6556---96623308737.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/drmevleooegd59r79ppkfk7and/feribolega.pdfIn PDF document text
    • http://turatabor.hu/media/vegutewi.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/61900080613.pdfIn PDF document text
    • http://btfa.tw/upload/files/rupijujusobos.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107190203459259.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/87902632251.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768a6dc68f2---48718960663.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/bomarinefut.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ttcc62rgc858kvtbefb354o08/69707521634.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/detas.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/48830558663.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/zadifugikovejofalumutekuf.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/33545163641.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/98409184589.pdfIn PDF document text
    • http://elma1.ru/!upload/files/8090103287.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/22410926524.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/gujadetumaluxawogavisomu.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1327487259610b2c3c2aecb.pdfIn PDF document text
    • http://nktrading.qa/file/files/tabefetuzefitarexe.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/43160068381.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_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 19492 bytes
SHA-256: f0513c9c69d56e5f41f801e363621d4ce947d5b7b51d92aa23fa5a9a8bafb73b
font_01_sfnt_off00012e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6A 11136 bytes
SHA-256: 6d6a264a4c62e2012c79d6b2214732810ba2acd5c0da41ffd144e16ef2e5b71d
font_02_sfnt_off000147e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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