Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28ac03fc17005bd…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 12:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a7289efbcf7f559355ab1b37fe9baa41 SHA-1: db962e6c7b271907d7d5537f5ace2295f10ade6e SHA-256: c28ac03fc17005bde705770b7f3ffe182fb2b5aaa61f9bdbafaf7638002d71c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to direct users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://afra24.com/basefile/afra24/files/moxijanuriborokojep.pdf In PDF document text
    • http://thunderstar.cn/userfiles/file/20210722134657866227876.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/sogesogozibonigumula.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/sufumamoparosajisevagufan.pdfIn PDF document text
    • https://anup.bo/images/files/68339123644.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/h8mm6a6mjvaggpt8qi7ha72890/xexarojometixivelafer.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/45455159335.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609473548bb62---4026877470.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/67031890789.pdfIn PDF document text
    • https://losungversorger.com/product/file/tifomakumu.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/wesududenoluwaduzorot.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/91467267738.pdfIn PDF document text
    • https://luminex.pl/upload/file/zemimu.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/41661179890.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/80572927612.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/kasefeborilujemuf.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/tixamud.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/gigevijuniven.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b12c76cb81a---lijiko.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/batjot2v0ttqht9ni1gumuj9rf/noxepesiselotoba.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/60416571225.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/nupodaleludojisupesuro.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609244f03dde2---kagabopi.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/kanasar.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/28801752129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=kamyab+jawan+programme+form+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_off0000e3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 10896 bytes
SHA-256: d6b7e818a2530c0b96d4c8891bd6b713d882241a0b6f3aa35e4d3436d99560f4
font_01_sfnt_off0000fc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 21276 bytes
SHA-256: 1bc87c87abd7d6b19000c6c4fb425c42067d966c38be3c3a1bde56f6a9e42dc4
font_02_sfnt_off00013447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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