Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb94cd5d088ec84…

MALICIOUS

PDF

77.6 KB Created: 2021-07-03 06:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 06981c8d0dcf3c7c39ea4efabb49acad SHA-1: 651cb9ad6aa7e30c7719480702a616d15d3d996d SHA-256: bfb94cd5d088ec84937531b429ad06165faac14418c1cd4b7fb0f586ec77283e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially leveraging PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://cructi.ru/uplcv?utm_term=american+big+picture+b2+workbook+answers PDF link annotation
    • https://ktmcollege.org/public_html/userfiles/file/mezavagawemelir.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/7e913f08aade49ea44aedb76adc5a24f/53551173577.pdfIn PDF document text
    • http://edgecs.net/documents/libejapifawufijut.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/lnh0t4g7jladiejd5106l5u6ds/12373644522.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/eb4f6954bfb9f3e932a71594d9148533/7861872919.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160758043ad6de---87160137062.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c625801c8a4---83824329953.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/817d5262fc683ad8ae8b83666e7ae95b/vogawukuvawamisituvaga.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2683f8f59a---dazilo.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/44757257448.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/bazegovunefakuwos.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/q5bcko1ea71q6v9gecfl6brqis/woxarodogafomofavexuji.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7d38f3cda---zeramomepoz.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/fanaxaponageve.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16074217e1b2c6---vesanepiwuxugaligumalux.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160838795d8457---45320394799.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/d3e12bcb166c87a93a04bb9024685ffc/lasigugenisogofarogud.pdfIn PDF document text
    • http://soles2walk.cz/data/file/nipujeg.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/eb8aa0b60586d4ea1861b7ede5512a2c/dunevurowaxazixima.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/52134777552.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/n2dkm6r825lbpk6j5havf5veo0/81367043041.pdfIn PDF document text
    • http://polletnv.be/uploads/files/fimodutaruzapurakizotito.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/tozajokox.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/46epkui97uq01832d4or18qtu0/43423618079.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/16132054674.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/fb6574fd88bcd492c21a00f606953a20/mituzulumesexe.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_off0000cacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACD 16388 bytes
SHA-256: 8ec916fa8a7217f1a6601972ae5e8b5d2efa8838b4f82dd650ace919ae6cb291
font_01_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D26 11192 bytes
SHA-256: 43e60d244d258115193b03ab370e0340320a7550af9a1ccc5cecb7efaf2778a8

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