Malicious PDF — malware analysis report

Static analysis result for SHA-256 c394f9565395a028…

MALICIOUS

PDF

90.8 KB Created: 2021-06-30 15:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ab77b89c18d76516e8357e62628f507 SHA-1: 103cb50bfdee405c61c57a654f6dfafffd6c4aab SHA-256: c394f9565395a0286a0885ade25ed39767de15bc4f50d514aa6afa735dec05d5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary purpose seems to be directing users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=overworked+and+burned+out PDF link annotation
    • http://pinturasoltra.com/images/slider/files/mupigafarelebakukoburuna.pdfIn PDF document text
    • https://kartplast.com/resimler/files/77598852014.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3205383d2b---tenukegonamafadutewejo.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/b1da58f264ee7eff68368aee4863b6d3/towuxevitila.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c960c680dfc---54431593907.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/18c5de882dffac70e51b5f33e7fbe8de/piroluxorige.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfdb4e0a14---48831888609.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/gizetawasa.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/ditinabuwurofawepugodixom.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a09530931cf---kusozisamikixokipidu.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/9805361fec34e50dde5280bc47c92d07/nipofexidenojener.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff4b77c3bc---25018654295.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe8c659304---vovenutitakodikam.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/1368b89a96604a89af0bd1757222a2f8/bunixusedutalidurafo.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/jurit.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/23957037423.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c59ed83311---luxururinoniseri.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/jeperodoxojafa.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/cdfc577cc6ef05fe478f3b0ddf1d4ebe/gibodelakawikitujazi.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/979u6tihfv5cspkr8medrllagd/tibuzefeb.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f058ada545---37273714046.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/5d4144e2f5bc746769bf1eb7ff6ca23a/43563453623.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/m3sqcgcmk7ufu4r2h974l4vogf/jifikal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10420 16236 bytes
SHA-256: 60865001ac0a0948fb3a21feeb7d6e2d9cd73b8696ad65f743089520e68dee9c
font_01_sfnt_off00012e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E08 10444 bytes
SHA-256: 51a15aadbcd5229c29903f8cbb4800d3478612f59097e54e970f79ef0867bb6f
font_02_sfnt_off000145e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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