Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ea31db11d8dba7…

MALICIOUS

PDF

81.8 KB Created: 2021-08-24 01:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49aeff2c124aae118bf295eae6e12a10 SHA-1: da90cb98a07a42cc5358b6f30d50ba36affb104e SHA-256: 64ea31db11d8dba7bc66fc70e3636dedc7562ff8031d8246148cacf541ab93ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, but the heuristics and URL analysis are sufficient to determine its function as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://onhimalayas.com/ckfinder/userfiles/files/25134187288.pdf In PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/kuvosugagubozubosititer.pdfIn PDF document text
    • https://yifff.se/userfiles/file/64203713105.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/8528942432.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/vdusvd65bpjvqrb3ktkg6qd251/59780818100.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/f51f02b2392c31a81f69cf2270dd6770/kewuzuxu.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/fajoxusuxajazulodemimi.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16084d3f0858a9---ditevofujutik.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/2891b15441489074d9b49207e4974280/84313783178.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/68904693436.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/dumupixamepuwebabow.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/50136168491.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/73261305905.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/omfec518kag0hbcqjdqo8gbnd6/75614328949.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/4mkh1r0nd6eapr1te8aqahu8l7/83528376449.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/gaxonedalidepaxanodinoze.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/bemewuxigolosovi.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/15752175866.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/segoben.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/57245190795.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0dc74b242---26389372913.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///jifudejopagalorifunebe.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/74675019131.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/39305806106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+back+of+the+tongue+is+most+sensitive+toPDF 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_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 15876 bytes
SHA-256: 0437d7782f9d7cdaf6c759c2172cbb6074baffe00699dfd90af42a0f84af84ab
font_01_sfnt_off00010788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9F 10996 bytes
SHA-256: d111e856cdfda441bf23f22df110a185a730f299c6d809614ea2f031ce5dcb3b

Open this report in the interactive analyzer, or submit your own file for analysis.