Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e177b37ebcb5fa…

MALICIOUS

PDF

87.5 KB Created: 2021-07-05 07:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40ebc8c15534c7a0ce1d247ced9c8c89 SHA-1: f79995a7d2e34c730e48a365707004a69eaa2d84 SHA-256: d3e177b37ebcb5fa0f36d725f4587fb3d66847d164cfec01d5f42785f0613bc5
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to potentially malicious external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://industrialdevices.in/uploads/24468041267.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/34168524292.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5550a2c4b6---lozuwakoferepuzepojufibo.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160806f8db0b79---6739037312.pdf
    • https://cornerstonelaw.eu/userfiles//file/tuvaxovekiwat.pdf
    • http://secretlove.ch/ckfinder/userfiles/files/xizopetoboru.pdf
    • http://remaining-mc.de/userfiles/file/welaxozufesude.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/sibudokada.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4c3efc83---rodowabogevurixitunel.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a08d4d9ad3b---bivadexebufenazibu.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084a645eaade---96118435461.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a34c7ecd96---xokejuwadewum.pdf
    • https://matrainagycsalados.hu/userfiles/file/82312490682.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/luvezuwetomoninemabefa.pdf
    • http://hani-bee.com/userfiles/files/guparurafunabatumabixopo.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea00a37831---76426554083.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//34422336688.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210611163139.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f603573fff---2535332425.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/4qiugjdrgq8citg36l2eerg54s/zewumadan.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e661d267f9---20170698730.pdf
    • http://musorcentrum.hu/files/article/file/42030346866.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ghpvtgmu5v73dhlidjnovkvfv6/kabufen.pdf
    • http://sgd42.ru/userfiles/file/99263814686.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/e63d70476710a2aa9316681961442610/8675488536.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=community+bankers+association
    • 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_off0000f16e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 16792 bytes
font_01_sfnt_off00010980.bin
feafbe01628949c9e1a54768fa1a0ac0cb051f020f089ef35f0350273f207f0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10980 17828 bytes
font_02_sfnt_off000137f5.bin
6c23f36f02631b3b5fdae0f795dfd6578a2cbc36520e48b0c8897694266604cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x137F5 10820 bytes