Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16d1cc90d4be349…

MALICIOUS

PDF

74.9 KB Created: 2021-08-30 16:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 848c8d5478274bd49762a32dc794d459 SHA-1: 72f15e6fdfa9fbb4ac7c637ad50c2840369e7720 SHA-256: c16d1cc90d4be3490ac55ccbd9bb79aca278fc4053ecbcf28e08ebbde6ab90a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. While no scripts were directly extracted, the nature of the URLs suggests a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://buffagiuseppeinfissi.com/userfiles/files/26895542956.pdf In PDF document text
    • http://ticketsperiodico.com/galeria/files/natezaj.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/17588387870.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/3206450476.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/78599821208.pdfIn PDF document text
    • http://henca.com/files/details/file/94584180303.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/xusipemunotegolomigo.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/5fd7fc2886e7699909cf0bbe8e072fa5/zaxuwidefago.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/duwavorazezogudujelo.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/54694293051.pdfIn PDF document text
    • https://pmms-online.com/assets/file/zuzifiwoxesetiburexedime.pdfIn PDF document text
    • http://iltorg.ru/upload/file/63181080981.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/68492111286.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/dagetebakibek.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/fuvikamatijan.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/hgcosntm6vphh0i82iho57bu62/92040697236.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/53533949584.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/kenujakijoxad.pdfIn PDF document text
    • https://flyags.com/editorResources/file///23418237581.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/3b65986de0fed710943eb96445d2a98b/70487394355.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/11cb0a8b10ea352ae16022e1576fbcae/64336952241.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/pegef.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/zedor.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/zofodun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=2+acute+and+2+obtuse+anglesPDF 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_off0000c001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 17440 bytes
SHA-256: 2e024d1402aeff486031477a6f16778a7f42ba6bde1a371fe8a6066b3b085eb6
font_02_sfnt_off0001055c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055C 10616 bytes
SHA-256: 0df5c55082a17e9c847d877d162ba30e9217c8822e0490dd1944fa510a968d95

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