Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5af118a9d10618…

MALICIOUS

PDF

94.0 KB Created: 2021-06-26 19:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 81ced27f634f86c6f24ca4325b024380 SHA-1: 0c8c687fff3584157686ecf01480b5dd13d87450 SHA-256: ff5af118a9d10618ca3abdb0682d125ba64d83cfed7f67f3ce66e80fa07d1337
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose beyond being a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 https://allytemp.ru/uplcv?utm_term=er+verbs+french PDF link annotation
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077ea0eadf65---vulojodazojuvukexa.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/kepose.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fff039519---wenipupajiwubebavonajudo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d825c666f---65195314620.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad7b8da4d7---jovodubikavorojezu.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/851c812a5bba4076e8ae4052382b62db/27953106605.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/58570411342.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/72443573233.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/94011684390.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/nazukidekesapobogiv.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b9b23459e---vedebevoveregisikonidulat.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/qpsopv63d2bul31ntsvaefbgf8/24852942376.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/87ed8590612e1404c8b4183955cfef5b/pudofemipofanaseninosab.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/wekanabegorifaferipuv.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/punozuvipew.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a843b9b159---pulumanodomisab.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b5a89e4de---roxosuzibasodoz.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/bn06414l9f5eajp4ujvnl5rag6/faladajejanol.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/biligalujixukeka.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/89204300045.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/cb834e54a38080a1268c6b776e28704e/14364658616.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/bb6065d24aa45ff6ec19333942c8934e/2434864127.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b245532e56---89330991237.pdfIn PDF document text
    • http://byecook.com/ckupload/files/xirowonowum.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 18616 bytes
SHA-256: ea763c19c85394a1e4c4b1ea56e841247c17906d153397a5cfedc80098d88c32
font_01_sfnt_off0001268b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268B 16120 bytes
SHA-256: 7cd650be26d854cfe21f1f4aada2ddbde382329d501a276ca3f46bbc947f3b5c
font_02_sfnt_off00013bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF0 10104 bytes
SHA-256: b4da34de848f4a6eb7295d7fb2f4471847c1090635acaa4736870d2b803dd5f3
font_03_sfnt_off00015270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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