Malicious PDF — malware analysis report

Static analysis result for SHA-256 309ff112c1346f09…

MALICIOUS

PDF

83.8 KB Created: 2021-07-09 13:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c3f7eec3d4e6646ec348775d5970f395 SHA-1: bfaa5c01c8b7c2da42306a60c963ac9959317836 SHA-256: 309ff112c1346f092f87c4d4d3d3e7ba0f2df0a7294ee7011a35aba60e5372e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The primary goal appears to be leading users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=exercise+to+reduce+thigh+fat+for+female+at+home PDF link annotation
    • https://vivekanandbawwa.com/userfiles/file/nixomezabiza.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/gupibupexirumebirizebu.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/56158772486.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/77ecd4141716c019234ab1a7f88cc9c2/dupefekenusijakat.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9e1e59d49---zizute.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/zojura.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/ad67174af4ece4f4b22df65f983e4f6d/23158502451.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/f9926973950846d178f8fc4e7a16c652/88758878913.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/1d6d719ddd9ebbf323292f27f3b3b1ab/57229746033.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160abe8194ec6b---tadiratomupadufon.pdfIn PDF document text
    • https://aokman-drive.com/d/files/difogazafomifanawiwobe.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6223a7db46---tuxadubavupenogago.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/40cb970c8c89e54c9b115f09b8f55dc3/18541189655.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072e3e6081ac---51146219526.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/pokaluredekanevuvobelaruz.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160906b385f18b---motuwonexepawexukakoxux.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ad85fea0c68---74728472216.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/71508996723.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/sapoxos.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/godokosuzezu.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/42355367864.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a649e09c14---40500789581.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/bililuge.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_off0000e30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB23 11004 bytes
SHA-256: a09875da64c47074687522641641684ec7ca279a6bb1cc9ad1a877b3592e1b6b
font_02_sfnt_off0001148a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148A 17600 bytes
SHA-256: b5468ac4c82ff742a5f924c2305f4e11e2aed5a2a24dca45bff5644065f5722c

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