Malicious PDF — malware analysis report

Static analysis result for SHA-256 450163938a0840e0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 19:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09cb04abc958ff3797366369cedadfcb SHA-1: 129b6434242651cb77f12d67dee07889f95ef853 SHA-256: 450163938a0840e00afd161fe0e52eaf108254b1a84edf572df765b37650efcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded JavaScript stream and a link farm pointing to multiple disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the phishing and malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://galluccifaibano.it/userfiles/file/95768565941.pdf In PDF document text
    • https://oklogistic.lv/upload/file/pimalurifuwizipuse.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/57158555980.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/20605194547.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/8eafa9668aec60a17a8dd2a0c0f24a84/kifofogadakuxe.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/bc3d093607bac69bfa79b6ea04cf8c86/banafefer.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/81a34c14c685dee73a43308fecc6c351/85209828739.pdfIn PDF document text
    • https://tavio.ru/files/file/31082197207.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/22614815205.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a31c81c610---49069791728.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/tibijufivotu.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/tufovamizukotujorux.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/lifezakin.pdfIn PDF document text
    • http://www.heksan.com.pl/file/vasuxemupowofukegozu.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/texemenekugefevobegukovev.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/db0ecb78893f12e7a7db741b949012de/97792925339.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160904cb7705d0---karavununiren.pdfIn PDF document text
    • http://93564497.com/userfiles/37570043605.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160725904ec3ad---11485812942.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/518915d3ba97e760f73eaae121b2bb54/93882816236.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/f78b54606d2d81643c2aedc1b04352da/58245098354.pdfIn PDF document text
    • http://ebus.cn/up_file/file/belazema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=minimal+interior+design+pdfPDF 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_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF410 17036 bytes
SHA-256: b1ccb28a932f47d5985895240e3daeb3573fdd0c661706c777a8d1b21f0acc0d
font_02_sfnt_off00012005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12005 10832 bytes
SHA-256: 0f288acde2084d81b32f9136c063acd3c0ab7f5ccd64a8a528e49189847f3e6d

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