Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78a7af95d1f27fa…

MALICIOUS

PDF

84.4 KB Created: 2021-09-09 03:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a58ddfd0ee7bd0051be0fd1bb27f4c0f SHA-1: 9e72ebe98c101c57b50ec2357b43b1f634a08d41 SHA-256: e78a7af95d1f27fa3c87d205b40a1c4f8096aba97287d49894fc241f4b4e0364
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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. Specific URLs and indicators for this sample are listed in the indicators section.

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://markaoyun.com/calisma2/files/uploads/31013137602.pdf In PDF document text
    • https://rsebolivia.org/userfiles/file/35488698783.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219306144050.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613916fe7e9a0---79181376676.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/13510235025.pdfIn PDF document text
    • http://logicamail.it/draft/media/69286029897.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/55344922272.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/34761345029.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/84081599546.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/34287951580.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/16450036182.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/35541552412.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304fff86a2a---65038265425.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/76792212038.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/79410947933.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/72642000990.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090601523892.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161377046ca63d---88130711172.pdfIn PDF document text
    • https://negaratoto.com/contents/files/49333513834.pdfIn PDF document text
    • https://baglab.pl/galeria/file/kitimazafis.pdfIn PDF document text
    • http://whatdwellswithin.com/file/61975708374.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/zofugevobe.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/mabuputavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=lucinda+riley+chomikujPDF 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_off0000dea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA7 20104 bytes
SHA-256: d787cda6610a5b90128030c7cb1418d7e38c307c41692731f2367eb62bba71a1
font_01_sfnt_off00011219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11219 10764 bytes
SHA-256: ec076b51324aea3df2be33f59cadcb96d46e81424b35843c311bd033a5abc496
font_02_sfnt_off00012a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1