Malicious PDF — malware analysis report

Static analysis result for SHA-256 bccdc91da9a90165…

MALICIOUS

PDF

86.3 KB Created: 2021-08-14 01:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d18d806f7bb647ec1ae0ba10dfa5460 SHA-1: ea2427553bb84e2911ecd2e285872c8713106ab5 SHA-256: bccdc91da9a901656f533183b684f40c1bd741fc37c064c8895432017c8377c2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://huntic.ru/uplcv?utm_term=multiplying+binomials+answers+calculator
    • http://musorcentrum.hu/files/article/file/20627793474.pdf
    • http://alexlunacoach.com/img/editor/file/mobibomuzadidofarur.pdf
    • https://ijpdua.com/contents//files/82193190753.pdf
    • https://cissud.com/uploads/ck_editor/files/wusutodagawe.pdf
    • http://kristenpell.com/userfiles/files/zubabevikolegezazador.pdf
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/88605503135.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dadfa7ccb---89132181612.pdf
    • https://nhachoxebus.com/upload/fck/file/22754608046.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/c09f9397e04f1db4fc63ac8d01e43e83/16455820624.pdf
    • http://rana-international.com/userfiles/files/5241399576.pdf
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/45948446793.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fb6029edc---13032474627.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5488b31a698592322a61ea6182681831/30479680144.pdf
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/20219864240.pdf
    • http://smflow.in/admin/uploads/file/81955138138.pdf
    • https://fentesmakina.com/paket/upload/files/zosomukaj.pdf
    • http://strategie-online.net/catalogue_dynamique/file/77858703727.pdf
    • https://adreshosting.com/calisma2/files/uploads/bogaxonanaxefutopif.pdf
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/lh6su778cr3htcecnfvhkmm546/wituropela.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/3720229f2c7b9090d5a23b0e244f7d34/badunuxajulefidome.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ccc3992a12fc30e99425a2f81c6e5aa0/6218558041.pdf
    • http://gamax-motor.cz/data/dokumenty/wemugagexetekovirar.pdf
    • https://bywuf.org/upload/editor/files/26053680998.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609757592bfec---totemiruxexodekileku.pdf
    • http://aep-tc.com/cache/fck_files/file/lirezinogepojigubo.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_off0000e501.bin
783e55263e9f3964188eaf14953e3c78d26132964f7f911bc1a5c95e08479671
pdf-font-stream PDF embedded font (sfnt) at offset 0xE501 18692 bytes
font_01_sfnt_off000116c6.bin
019f6c7b6d8c7fb1c14bb580b76909e1bce71b81761f22f175c71609d973652e
pdf-font-stream PDF embedded font (sfnt) at offset 0x116C6 11152 bytes
font_02_sfnt_off000130b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130B3 16792 bytes