Malicious PDF — malware analysis report

Static analysis result for SHA-256 8764c1bcbb9b4f07…

MALICIOUS

PDF

71.6 KB Created: 2021-10-06 22:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 15e5f70609c954519d617815a3218651 SHA-1: d71fe2ef18c0997da43ac16adc887235f8ec2d2d SHA-256: 8764c1bcbb9b4f07edb0a82df592a2c57844eea493a94a52202b369ddd15368c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to PDF files, many hosted on potentially compromised CMS uploads. This suggests a phishing or malware distribution campaign leveraging SEO poisoning or direct links to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://ashole.hu/UserFiles/File/mafodoloxima.pdf In PDF document text
    • http://fsanaq.com/upload/file/2109151026412656268u8ars8dxyal.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/zijixugajekosulevigisu.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7b828b104---zomepameses.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613736bd00376---tamoxekafiwaxak.pdfIn PDF document text
    • https://tigaintan.com/contents/files/43603295928.pdfIn PDF document text
    • http://space-edge.com/upload/files/14514650539.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/bireguwunobomol.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/sagovawesedowixofir.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/zovadagewupi.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/97678187624.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/nadutemosarurotodifakawu.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/45439895453.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/mesafigazigapujimumi.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/vofigudeda.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329da42117b---dusuvedadazukusok.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/8214232479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=top+gifs+of+all+timePDF 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_off0000b7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D6 16304 bytes
SHA-256: 23ef43ebb8f8958d4e657b781790eb9052eb73383e4effccd8516a0fa185d6fc
font_01_sfnt_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 10460 bytes
SHA-256: a1417d5702df25f521abf435638d5c6b9adac15c510544e32acd9684c5f97674

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