Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb18da8d80a99402…

MALICIOUS

PDF

89.0 KB Created: 2021-06-29 02:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3da284cb52cd8be58d82e515d4db8ac0 SHA-1: 21d9fd49c56b631136a9772cb992f984a16b5017 SHA-256: fb18da8d80a99402f87cef98153556ad5d30f957d77213a1de77cc0b75c92508
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to various websites. Several of these URLs are hosted on compromised WordPress upload directories, indicating a potential distribution mechanism for further malicious content or phishing attempts. The presence of multiple distinct hosts and the use of UTM parameters suggest an effort to obscure the true destination or track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://shellserva.nl/docs/Image/file/darulozunomido.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/jesuxikokojulakelesowipe.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a242776e---59321166996.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b00a815c3---85494326036.pdf
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/f6fbb2e8e0b1e5c8d2455e96a303abf7/62978552396.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/34ee00143232d11819490574896c6102/40667985209.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb9875a74---jadulozinefaw.pdf
    • http://arcomproltd.com/userfiles/file/25376391548.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c15eff1d---92166337638.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/59fe7f1d3e23d18be52efdadbf9531f1/28427975734.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccabd0cf8d---23979116625.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/saffrbt245c6ftv4vkeh8pf834/xuponiteforapiw.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/b7956298a7b134c773867e08bc61b7a9/robiraga.pdf
    • https://hgb.se/filer/file/21541323324.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/4d6ed5652637fe02a6dd6e7d31504905/10981673653.pdf
    • https://ancoraeducacion.com/images/37240659082.pdf
    • http://studiorumeo.it/userfiles/files/11655426838.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b81b7de531b---62206452174.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/l484e8nuvq2fu8pvi4idio93m5/87997790827.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905ecae7555---64492217652.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/965o2gta6fv77t72pk7liql6o3/78752447093.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=example+of+survey+questionnaire+likert+scale
    • 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_off0000f72f.bin
4c6cd5e5f242cc506814b2d85f1a82a497beac6702447d211c9c82bcc386acfa
pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 11244 bytes
font_01_sfnt_off0001119f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1119F 16792 bytes
font_02_sfnt_off000129b1.bin
9afc9092c2accb25fe1d860e5d52ce9e6ba229342438ffd9a5eed4da043c9d96
pdf-font-stream PDF embedded font (sfnt) at offset 0x129B1 17180 bytes