Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a8a649e27effa0…

MALICIOUS

PDF

77.2 KB Created: 2021-09-01 06:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: abcc806ac85bc6a49fccf88e60e7c54f SHA-1: 4c58585127328438e25b908c1480a9971d0dbbd7 SHA-256: e8a8a649e27effa087e04661dbc034e6ba1f836d6c6d66a61e9c3664ac9825d5
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=chapter+2+science+class+9+question+answers PDF link annotation
    • https://ludifrance.fr/userfiles/file/4364014716.pdfIn PDF document text
    • https://proxus.nl/file/genokewubulibiwugepaturab.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/93133373805.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210720025806_dy8maj.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/743d7e8dd326155f558b850c42eb2ec4/67713286808.pdfIn PDF document text
    • http://360global.ca/userfiles/file/denuzulalojumelifobegini.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/32853645025.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796f9548934---46205632162.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/11708932702.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b268a6cfca14653432df464298d88280/bibazi.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8803a2bd98---69615388075.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2741a068b1ecf01919172a791e04f3fb/54581953959.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160943b8582f77---roxataxobukunasi.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd6dfdd3cc---50025948815.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0e3dd7bb5---wevagodikakufa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108e99d08b87---10124636993.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/murawatodelesuke.pdfIn PDF document text
    • http://houselandia.ru/files/47298963956.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077e263634de---76165625397.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/69457719161.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/fagitikubolutopamufasos.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/bifebilavozuluvumawenoda.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/difurefuruvamamezoji.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_off0000c623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE35 17536 bytes
SHA-256: 7bac8acdcd5bd15b97f1c218f99fc1c9bf6cea68974077b4a7c74e81ed746d05
font_02_sfnt_off00010b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B61 11124 bytes
SHA-256: 7dcd00eb1a2f3ddc20cc1d0377dea854fdf42d6574b47b57ee4fd56ba2406b7f

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