Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba31967a09815eb…

MALICIOUS

PDF

80.3 KB Created: 2021-08-08 18:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad8ca8ff7e66933a1fa30571f55b8db2 SHA-1: 66aa1fc9a546e06d0bef1943b40b9ec5cbb10604 SHA-256: 7ba31967a09815ebfff171e1ea0888be9e4fbc177fe41229a6d9ee3f691e1d7a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using these sites to host or link to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://inwebjor.ru/uplcv?utm_term=hold+memo+dr+negative PDF link annotation
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/6fd200ddc4bc756767e4055d111bdefb/10246376986.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///zonigulera.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a36771d609---65860553933.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/25496056078.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b445ee10e8---judovoxivixugufexoterofof.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/kubefigina.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/3943175805.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/warosoje.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3f7c7e54be3fd9d82054847d0749fd1d/79657783411.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/3ac9692d64510a128c5e1b7aff865cf0/56201009354.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/1d054168d86094846ea52a2343c7cb88/59516921862.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a95175a69---28885462384.pdfIn PDF document text
    • http://servmed.net/userfiles/file/viraf.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/napidefun.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/77ad06f7a215f6724e8d021d555d7923/30426844824.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160a14151276f9---sibivibesiwa.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/zopemoberogodolosuzef.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2c26e8aa---71407335453.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/samej.pdfIn PDF document text
    • http://bjjiffy.com/upload/deratij.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/32966807832.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/zigemiwefibopa.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822fc0edb4b---pubuvasumaxorufegonebef.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/d2abbdd84fc9a714c56377fdb8d9c8a2/90490133280.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/fagume.pdfIn PDF document text
    • 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_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 10480 bytes
SHA-256: 32e81c6c305ac6b494996154c7b3230d62a8c4d5b35aa92e96bbd40e39b05a03
font_01_sfnt_off0000ef02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 16732 bytes
SHA-256: 8bcc68659194546d4b735b2e51fa1ac9dcb938a8ede67fc157d7d4d83b79d16e
font_02_sfnt_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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