Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b197d504ac78f3…

MALICIOUS

PDF

83.5 KB Created: 2021-07-21 19:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 07021ef776a4113f3859c0c007b4ddfa SHA-1: 6c5989c61a6fedda4eb2a94afe76289069c8acf8 SHA-256: c6b197d504ac78f3b0a78d33878f50487e771807997da1de9f840920fa8467db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of a link farm and the nature of the URLs suggest the document is designed to lure users to external sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f26ec95c2c6---kolige.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8bb9ee3e---fopujugotuxaxe.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/71664987222.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/b3e367b3cbfcc459c3803b761f83ee35/majifegude.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/sigojiditibofazotami.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/4c1dabf956708cccb703104afa2631bd/gasaramiz.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/wubatenuxejujip.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/37761286590.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/578d2055209aa5ad4f0ab379f043fc56/lojazivalerekig.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/95535828326.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/banupiwa.pdfIn PDF document text
    • https://premiersuli.hu/files/files/todogazuborew.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/efdc1eccf6fd46361fd557cac0d04803/80956462317.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/4fd19ccfcfd804357db03c47fd7290b2/79577338085.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/sipobiwibogofesatozev.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26fc123f29---54903926511.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/c762ba2ad59760ae7d33ac8621614a5c/72932591174.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/luxiwuxisugoza.pdfIn PDF document text
    • http://minerva-collection.net/files/files/5274155065.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/33193478079.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c9748fa23---vipiboku.pdfIn PDF document text
    • http://www.toptehnik.si/images/9649408762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+plimsouls+a+million+miles+awayPDF 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_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 17632 bytes
SHA-256: 052514c6d9fc4c2d368a60ae091ad70264241505b226a22aa80c35a7e96bd40b
font_01_sfnt_off00010fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12800 10584 bytes
SHA-256: e77d317874bb7f4ffbcbd08483299faca772046cc6c7e18b02a72abc42f2daa8

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