Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff16d358a2e9d23b…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 17:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ccc1026ce480623bc9e92276e6488ba9 SHA-1: 4e8ac2e980022e368b4c50a5ef9d55aba3b1b73b SHA-256: ff16d358a2e9d23b85628119ef7cd719a8160c1561f615aa1a32f1216f605f64
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection strongly suggest this document is part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://granitnet.hu/editor_up/78410878290.pdf In PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/velexiw.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/18767175101.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/1p56bonogiod8vbe5mh348q66b/basatixe.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/efabedfa897dbe638ec0ffc5922a7dff/napokataniwekonuxawaz.pdfIn PDF document text
    • http://www.moyekolodin.com/files/41117412806.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/62398366141.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/b3rh2afqokr2ccn7t5np5aaauo/85220607198.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/figuvatuje.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160820add98a0b---9156937886.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16094bbe5b08e1---vawefumafazuguraxod.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/pelepabasivo.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/7821687201.pdfIn PDF document text
    • https://dafelia.com/files/74829100106.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/ritasijisevomuberuminu.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/58327360801.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/waraxifekevigakanad.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b1df2b8fe---68201059656.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160adbde683159---22585682344.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/volajimamutuwexubogolij.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/63426789883.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/88852398957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+number+to+vital+statisticsPDF 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_off0000e59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB1 10764 bytes
SHA-256: 22b4de7d10422cd639c42ed2eec4a5fa7aaf6eb92ab33e289ac0a00d0e8abbec
font_02_sfnt_off00011644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11644 18164 bytes
SHA-256: 8c8130a1c87c31f13862b3f388f570e87bca23c28c9b31be71846fec2793ae74

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