Malicious PDF — malware analysis report

Static analysis result for SHA-256 15bd174b947f88f6…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 02:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 717ab217aeb032ee8a56e4b85bd408b1 SHA-1: 774765e473e10386b969ec1cdda2f34d0f155bde SHA-256: 15bd174b947f88f6879394732ab39a9e352361399e06975122efb6f63e8d938b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The document also features a link farm pointing to compromised WordPress upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The presence of embedded JavaScript suggests an attempt to execute code, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/domutikovikefetedomigib.pdf In PDF document text
    • https://hometeamcorp.com/images/usr/45243380943.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/39264206779.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886f11363f4---ronisamejo.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/wikudivuf.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/51664756010.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160789f50cac43---50575741108.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a637881476a---vowowudapixijaf.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/p7c7lomlueaol9a316r25jgjup/35041625773.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/87707283087.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/2389863164.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/5686an747031g4fc8i1qdivhea/71569682408.pdfIn PDF document text
    • http://firegallery.ru/img/upload/68738740399.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/06/20210616180930.pdfIn PDF document text
    • http://bastola.org/userfiles/file/71091137397.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/80f1197d4dd0997eae043416b1a7cf3f/98458614192.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1ebfd20c2d78d054f6de1f57da706876/nodanosak.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/pibakikikane.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/98622502091.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/paluwiteluwotutozoxedi.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160856ff9e1738---48663353587.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/67139783577.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/38468112263.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610d78e80eb45---basogesaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ammonia+gas+sensor+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
stream_003_off00010250.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10250 10676 bytes
SHA-256: 26328406f8a49e173fd77a17848ce4fd0a5e2e2e96552137c618689e5d337493
font_00_sfnt_off0000ea39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A87 18568 bytes
SHA-256: e7d0297e76bb5815e6a9d2fc94458e9d4b037ed7965fc071b12d84a089cfa6e9

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