Malicious PDF — malware analysis report

Static analysis result for SHA-256 d865e362d65c120c…

MALICIOUS

PDF

95.3 KB Created: 2021-07-31 10:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 14c150fe4d1568116e78a447810200ae SHA-1: eb0c8cc708dfe3e029381e029039ccce63fe78d7 SHA-256: d865e362d65c120ca1f059dae53aca970e51c4d4973fac9e8fbf4a1553b1b7ac
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable hosting. The primary purpose appears to be directing users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.ecvbrass.ch/user/web/file/90201342011.pdf In PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f30cc168242d5f77a7f3cb7cfc26422f/53903903247.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/sabem.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/15a9e35be49fc84d4e5a23c4e9a988c7/14642201270.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/0dd84a6777c2f1a0e95796940b3bc9bf/girureza.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202107250150187617.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc1278872e---18262651298.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f80e20b9fc---wotelubimivapawafu.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///miwulidixegap.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/butabemulajeve.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/53350455401.pdfIn PDF document text
    • https://europartner2.pl/uploads/87234886657.pdfIn PDF document text
    • http://berbun.com/user_img/file/nulodulibusijutuwum.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4c241607f---54966341041.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/25468540632.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/93320242298.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/80793898374.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2eae4971dd---85168641106.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/75826667263.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/78033693297.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/puluwuk.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/157e4cd73aef9278c7a40fd29e450d43/fajekawarexajixifi.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160af901ae4a97---22226951243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=essay+questions+for+a+long+walk+to+waterPDF 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_off00010c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6E 10908 bytes
SHA-256: 287922adefc8424f17233bb1a11dcfaf0ddd174a36637be9d3005a00b78c8cb9
font_01_sfnt_off0001259d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAF 18308 bytes
SHA-256: befd1802d9b0c76bb6a47b7d4cf2ca416ff57a6f7a319f4591c8b68057a0a3f9

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