Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8829a7b717b06ca…

MALICIOUS

PDF

86.1 KB Created: 2021-09-07 05:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 0283cdeb0555620d540ab6f9fb36d585 SHA-1: 72e9d7ede3bd448c871a38de9233cc67db99e5a5 SHA-256: f8829a7b717b06ca034634dbbccae6547722ed8f2a34b1aa7c315a0928ce3a45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9912

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://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/22adfd44acd10c34723a7efbb7fc9f53/58709767098.pdf In PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/d26f57f8545ef6031c1e7c67f7e735d7/negifimekunugapazowigapak.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/idcnma9m6dq95qj5r9l4r5a34d/lilazunujipalebewiti.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/767722f782d0b9f332739f37f1163e41/33411916406.pdfIn PDF document text
    • https://tempegaring.com/contents//files/907736704.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/70452731357.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2a53ca14d---puxexilazazinewu.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/38678383343.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/rupejirazisopulimaganepo.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/kogubineratuzenoladotemi.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/95226935645.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/4935407147.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f83792e5ff3---77087768049.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/wuxaxijarul.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/28de07fd13ce1ed54fcd325bf0b3c9b6/78237549354.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2c1fae63d---81889448548.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/58800857993.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/bugejux.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/viruvedovugexeli.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/xagogoxovapulidimujo.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/6056831c6148b909bc2fec5b1fef2dee/fofadobejab.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160bc18b220112---73971221034.pdfIn PDF document text
    • http://splogservice.ru/content/file/tozovuvelokuvazewusipuw.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077673f7040f---vuribemaniki.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/nutepipegukenigizeve.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe004573d3a---kejuwaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=transcendence+book+pdf+in+gujaratiPDF 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_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 20296 bytes
SHA-256: 735290a35cb891596494f3470fffdb334e530ee8f1cfd8417b3adb1840ca6569
font_01_sfnt_off00011842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11842 11176 bytes
SHA-256: e48749bda2fe14b18a395b2d2abb3f315663a2c21c1ff2b37714640543588be9
font_02_sfnt_off00013218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1