Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90d11d731bae721…

MALICIOUS

PDF

88.2 KB Created: 2021-06-28 05:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6012182c5cc67e43657be61e1206398e SHA-1: 706a7c5233fa299f9b7552c72504ba64941696a9 SHA-256: a90d11d731bae721b5b217c3ee2f1b58e183e42624dcb45fd72320785a9f2b72
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608195a98f725---88482362957.pdf In PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6c0b2d45364d847c4c31a38ced4e9b8b/80412611277.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/58294991253.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/luvagajajetew.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a60e2101b---fojojosolebid.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3b8675af6---48364462923.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/4963f9d4a5dfd6fa147384a58de47672/fovubitufifubolep.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/salelafurikibufawasek.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855f4490877---2835328249.pdfIn PDF document text
    • https://loctra.net/userfiles/file/vikiviwejufikerox.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/welof.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/98163416498.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/xegesoguzadaju.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/jopogapidoxose.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/30273713721.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/1b658c201790d85c980db0ccdbed684d/denolixiwu.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b832b0f2783---firemu.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607527f34837d---tudakoxuwigadotugu.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/61987368004.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085ed74d15c2---39460581043.pdfIn PDF document text
    • http://industrialdevices.in/uploads/dogaruxipirubigi.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210609202729206687.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/toluwogonosusapenig.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/2d8ac36a4ffd6abbf872f94c660e7d11/40309774836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=best+live+roulettePDF 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_off0000f6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F8 10056 bytes
SHA-256: 5f284ae7ece99fc2e9ce663f16af61ff37a262a7489e66bb96d10b3a188265a5
font_01_sfnt_off00010d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8B 17728 bytes
SHA-256: 0e737d277d5f856e5123ef736946456ee10a114f3de8ee449c0c656cd2e7cb2c
font_02_sfnt_off00013ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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