Malicious PDF — malware analysis report

Static analysis result for SHA-256 077e7674bbbdda98…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 12:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5d4b7dc1691162dc46d7623c33b91533 SHA-1: 77c1018049a4136d3ac7e64ae69c4ed452c24db2 SHA-256: 077e7674bbbdda988a8f81019d71f30a049b37ee3676d09b94bc4b16e3fba446
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 ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS upload directories. This suggests an attempt to lure users to potentially malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://successalpha.team/upload/files/58852809093.pdf In PDF document text
    • https://imaggu.com/ci/userfiles/files/65547148576.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/vakukosemituworutesujezom.pdfIn PDF document text
    • http://355353.ru/userfiles/file/79866412821.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/fubukatekasi.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/73256192953.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/69703436444.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/37406622422.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/66888816455.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/lisuzizewigajiwimugubeko.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c12c907838e539e1d41b0f50f0eadf1/polomiluxajaxazaxekesutug.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/dagoviwefarokiz.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/wuxolu.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/97703537872.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21b17e380---befagapix.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7f2ea84f5---sakarejeredivobev.pdfIn PDF document text
    • https://bliznacite.com/files/gexepugavofegexiwute.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/70270814173.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/14143897807.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/nivezafemuj.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/91611685903.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/jexufuzaxezovopad.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/kokenizukomawugijikofil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+write+a+compare+and+contrast+thesis+statementPDF 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_off0000d81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 10808 bytes
SHA-256: 9f0eea747d2dc6f436efd34d5a72925e7b3c7720f9718db46f72d409050f325a
font_01_sfnt_off0000f0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 17168 bytes
SHA-256: e6c69756e3b7ac22d92795a50e3effd7f8126d3e76df2331a9faccaef0d385e8
font_02_sfnt_off00011d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1