Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c80f5d78d3af3f…

MALICIOUS

PDF

87.3 KB Created: 2021-06-30 03:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e705852848a76bf173f4c31823aca7ee SHA-1: 4594b2b6de02a1a2e6de7981f07b5418701e2419 SHA-256: 29c80f5d78d3af3f6a02376b537e6ba27b4a53f7a69500aee67ebb2ef171394b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, employing a link farm strategy to direct users to potentially malicious content disguised as an ebook download. The presence of numerous URLs pointing to compromised CMS uploads and disposable hosting, combined with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it facilitates the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=computer+graphics+ebook+free+download+pdf
    • http://www.zywawiara.pl/pliki/81412442529.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e36533fa61---vefojogezodejotip.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160857c031ade5---merefo.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160940a344c389---dowaferugobaruzive.pdf
    • http://angelescare.com/userfiles/file/95969162736.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/rlk2dkgc2eanjeibj5q4pnvksk/viwagadewofirovegijo.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/c85gdqpfpq0l3ofpl58qci0mfh/17348323906.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084f4dfd63d2---14759925011.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/82769767172.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ea6a65be5---96438604702.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/0fef12811b37fa7991974eeac01273aa/61468199675.pdf
    • http://thsport.dk/ckfinder/userfiles/files/77561392005.pdf
    • https://copperscraphandlers.com/ckfinder/userfiles/files/jedivizakebu.pdf
    • http://backupcenters.com/userfiles/file/93750574934.pdf
    • http://ipmarketing.net/userfiles/file/79349014736.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73e4649ee4---vazagidorumuxalozu.pdf
    • http://ehs1958.org/clients/73155/File/41454946698.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160838033591ea---1333896058.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e343c95c---jutososojabamazugajeduka.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb33a4b2dc---40244079876.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/6e8ddq6vfcnpcrvn72l0v1hir7/61529950030.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ff17631bd---99725641884.pdf
    • http://akcjonariusz.com/UserFiles/file/fevilitifutakulolufi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 16792 bytes
font_01_sfnt_off00010581.bin
2bfee78fd212a3c3ea57744263d92a34f6f32f4c64247659fa70904756306735
pdf-font-stream PDF embedded font (sfnt) at offset 0x10581 18064 bytes
font_02_sfnt_off000134c2.bin
a5f7d66effba30f013a7461bdd43f9a4bc8642d4a920bac18a039a53926dc517
pdf-font-stream PDF embedded font (sfnt) at offset 0x134C2 11516 bytes