Malicious PDF — malware analysis report

Static analysis result for SHA-256 276c4c5f696f93ef…

MALICIOUS

PDF

107.4 KB Created: 2021-06-19 03:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7b517765f87b4ad99f928efbbd7039c0 SHA-1: 6f5353803330d729f9d5ad1239b1d4cd49de52d5 SHA-256: 276c4c5f696f93ef10b94e23cd69de12d089e8d70aa75c7fe15fe9a05094a84e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a link farm pointing to compromised CMS uploads and a visual download button lure suggests the document is designed to trick users into downloading further malicious content. No scripts were extracted from this sample, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082c79c45f56---dotor.pdf In PDF document text
    • http://akicgiyim.com/userfiles/file/2834016703.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/sodijogo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/87855101350.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b313be10b---zokebej.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ebnakag51chs9djlmo635sq1n4/fokotilifakeruvoxuvajemob.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5ca87b14520a0cd1935876a750079eea/mumefevokikefuk.pdfIn PDF document text
    • https://flyags.com/editorResources/file/%5C/33727704080.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ve8bu6tk8s11tav1o0nks2j8u1/80330532737.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/9565ac8560dff199dbf354eca89f142b/fekisugezofodupajeb.pdfIn PDF document text
    • https://computerzone.pk/file/fudarazobusevuxedum.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d99e4a84---musok.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a39425f69d---80594871363.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088860f02857---zakaladelejosobamafiti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=sniper+3d+premium+unlockedPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB1 4964 bytes
SHA-256: 218940a02455dcb8576e3f03123f57be35e51bfe3715e503b549f63e7fae4bec
font_01_sfnt_off00016c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C63 10784 bytes
SHA-256: 153d5252ab61c827099f5bb04481a2b2025f749b9f704de1b6669b51e4ee3630
font_02_sfnt_off000190f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190F2 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71