Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd6b2e98bf707fc…

MALICIOUS

PDF

82.5 KB Created: 2021-08-30 04:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: afef8e03dba85920fc0b826359447738 SHA-1: 4c1eab6c40e82f57fdd5d2873c241eaa84a7f3d6 SHA-256: 6dd6b2e98bf707fc602a874a03ce951d4f8ffd8fa2d55d1092859eecc73dd47a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a898836cb76---23081231166.pdf In PDF document text
    • http://karpatskiles.ru/store/files/menufir.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612901662975b---34543724738.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5fdc87bb---633760097.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021080308464365.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095294c30d6a---58524685186.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/zalikewagekarafujefun.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cde18635dd1---56065032587.pdfIn PDF document text
    • https://protrialse.eu/files/files/40262035904.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/10459975116.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/0cf40bf8328a1c7effb2e1eb850e93be/xofuxawolezila.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/92004788806.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/tukikuvoxupenutuw.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/repimuzeruzarusaxepa1622780426.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/10367917351.pdfIn PDF document text
    • http://eventechsite.com/files/files/pomexebidorefapoxavep.pdfIn PDF document text
    • http://fedime.org/imagenes/rufapi.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/wiwowotixesokaxoxegefad.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160840d7d677f7---56511531028.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/efa0b7ebad868e5985684fddf941640e/bebikikokugenevasugob.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccfb71a89d---37369365420.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/dfaa06d796b9c66938f143970caeb27b/xemubuwugerugawalaxirix.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/3153940855.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/64851181223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=py6+to+hkdPDF 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_off0000ddef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEF 18704 bytes
SHA-256: 1efc25f7d7d18b6c68e5cf589c3d91773a837e7ea856274f11d9a647ce3e76f5
font_01_sfnt_off00010dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12611 9916 bytes
SHA-256: f611304e6b55a7d85df4d84a40d644f931ed149a893674b745302505d46ab407

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