Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76f517b4c79ab4e…

MALICIOUS

PDF

84.4 KB Created: 2021-07-31 17:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a5033883cbce72a428820ed5f2d40f9 SHA-1: 7dd72786dec17406424e970de8b373bebcabe5a5 SHA-256: d76f517b4c79ab4e93b040f8f9092cf685022ee58d6595f112bd59f8a64491f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host more PDFs. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a3d70a7e975caf965efc190111213d6e/86735779004.pdf In PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607386a45445e---zuralovukadarebap.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bccf6a1ea06---mojuzanibumesab.pdfIn PDF document text
    • https://andrejc.si/files/file/96562056287.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/4a518dbae41b3bb271f75ef1df61a763/12120685524.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/juzeworadedajupetota.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/35068162236.pdfIn PDF document text
    • https://termofriz.rs//files/28985245542.pdfIn PDF document text
    • http://keacg.com/upload/files/gabadizisexomatuje.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608410b22f7b1---24595097652.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9853258499---sejilitijazesiwok.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075b40fd74c6---34713694274.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/98502093459.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/6b8f1b5dc47b27cd40dc235c15e2699a/zeragone.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/jvek40ie3vrscuhngf1t8flc30/57386063710.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/rumilarevorazudug.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/2836df41d9ad5e157ba5085c56e42190/76680040447.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/20838989793.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/vunijidepebinofewumukuj.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/mapozapun.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843f6d22a36---45978909969.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/tizapago.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/3e667c7770e63647ff44971d485c1e64/57652616358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=sunlite+suite+2+manual+espa%C3%B1ol+pdfPDF 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_off0000dfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 11060 bytes
SHA-256: 61cbc80f40955d6c77ddb979f3979a1bd07eb813713b4f5efedc796936466fa6
font_01_sfnt_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 18680 bytes
SHA-256: e97bcae50536880d8ca65e09e82bad83fd9d2b9d19421466e8e554c35b966ec1
font_02_sfnt_off000128e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1