Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78440e4280037cf…

MALICIOUS

PDF

85.2 KB Created: 2021-09-06 17:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 276c46a9a5ee269f519c409c7f5fefc7 SHA-1: 9167065a0e144a32e5a09fcebd719ce5d804c290 SHA-256: b78440e4280037cf9559ee616fe1a7337832f8e7d9a23badb8cc28b5617cbd9c
156 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 phishing or trojan payload. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting. These links likely serve to redirect users to malicious content or phishing sites, aligning with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/001448dc53f359a923a1bd826c34f6da/91231974501.pdf In PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/35353923359.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/zudozovokikujoxos.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/14590389346.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a75e012fb2---tawekesujalasep.pdfIn PDF document text
    • https://riwg.in/userfiles/file/17729468555.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/wukekoziwiji.pdfIn PDF document text
    • https://people11people.com/uploads/File/42000002165.pdfIn PDF document text
    • http://www.heatandgas.com//EditorImages/file/79239320905.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0249f1019---xifejibi.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/9143289437.pdfIn PDF document text
    • http://weingut-suppan.at/files/76427913229.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088cf47aef73---xaruvu.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/jitaxumifebenilovezepefap.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/46940696433.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/89654585841.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/77535928974.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/3qiohc6h1de7irm0n1m5gv081f/16213020636.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/kblpb7shteki9bs6ee5ftvfrrp/fuvarelufutubupukizir.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/52963309967.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8904847ee2---88155972476.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/88b4d99d796071a978061918389f4050/44704805435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=holiness+of+god+rc+sproul+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_off0000e8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10107 17660 bytes
SHA-256: de3133ba121651dc33aac1395cc9012d5617af8fcb0f0e205dc604e223507b19
font_02_sfnt_off00012f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1C 10628 bytes
SHA-256: 7c8a0678bbb59a57b2ca152f6deede002b22d0825ba5737a196034bab6176945

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