Malicious PDF — malware analysis report

Static analysis result for SHA-256 0901296c0bab25b3…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 03:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 75629e273436456f874a614956471a7b SHA-1: 4695e5d3119020db8159507619b46a85895b46bf SHA-256: 0901296c0bab25b357f72ad27f6b51042d61cfa9ad5610bb9a509ba7d05b0e10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612e7aa64b190---67756576776.pdf In PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/bifasi.pdfIn PDF document text
    • http://atomleasing.ru/media/File/25234270693.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e6cd1ce8f64---73512589587.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/c52mpicm8p4agr83968ln8aa65/38960929791.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d373d3539e---91653921413.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/petijemuridixa.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16074f90edcb9e---pofikilawuralu.pdfIn PDF document text
    • https://sanidom.pl/img/file/fikakegasawoxefegatom.pdfIn PDF document text
    • http://hagithanh.hagigroup.work/data/media/files/negugizigutifiwol.pdfIn PDF document text
    • https://85097781.com/upload/files/91862728664.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/cc00c8abc94d81f41d26b0cb6358ebaa/32563024262.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/xafanik.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7645e6ede---gokuxosiveg.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/27804968992.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/36962211421.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/14407720751.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070ff40486fe---putituwufuwemokesid.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f75d482ef8---80295398641.pdfIn PDF document text
    • http://seamacros.com/upload/file/sunavarililapolidu.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/53450169046.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/eea249ec03740cb8917d1acd8232b807/lekujexovewe.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/39347363717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=petulant+in+a+sentencePDF 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_off0000e389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 10104 bytes
SHA-256: 6dab742bc2f7d2e1055085372eb3481ea256255fc2d015c17b4189f9789691be
font_01_sfnt_off0000fa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11246 17932 bytes
SHA-256: 9406e30f3d1e9a7401f6026b9f81c9354af5538c80f8850aea7667c752ead5b2

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