Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d05a8250eec5c8…

MALICIOUS

PDF

84.7 KB Created: 2021-09-04 23:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f3b9154c5a182ff93b75fad058475d4a SHA-1: 8a0650116975d8573dd6ba2d9c3016ed051a4ebc SHA-256: c3d05a8250eec5c8a201a9829ffb82e67d83bd139f5e9f69483c874bc2f30eb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://an-professional.ru/img/files/file/24433513506.pdf In PDF document text
    • http://sunjewelsonline.com/userfiles/file/43119363371.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/37136280.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608372eb64cf7---99841632524.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/bavuxawofesel.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/gh5m8i7jm2jjkpqd4b9nj1vcq1/jijij.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/rupipegaxaxire.pdfIn PDF document text
    • http://maihome.hu/admin1/file/pimepezun.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/52448415247.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/4712461076.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/38509372787.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/jdjjd5fhjoega5u4d3phe6uohb/87581813070.pdfIn PDF document text
    • http://beta-rc.com/upload/files/30827542864.pdfIn PDF document text
    • http://winso.tw/userfiles/file/88453229411.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/25921399598.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41bf03da5b---47652264177.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/56658537879.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/77992115131.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/fibuwalurumajowogisezatun.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/38a84ebc40e6b065bd68199d970c8615/86012827741.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0163594e7---pasawa.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607835ccdb2b1---xowesesigivizuwukuxumawe.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/86365605055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=bitwa+pod+grunwaldem+tadeusz+borowski+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_off0000e296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE296 11372 bytes
SHA-256: d1be267d185488b02ffc75b44070c79619ac9253b44e3aac7dbdb63fef5c5ee4
font_01_sfnt_off0000fd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 18532 bytes
SHA-256: 218d1a4afa69ffafa4600bf385a28f00c3e323d410684b77710afe26d3303cd5
font_02_sfnt_off00012b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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