Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a39760b02b5630e…

MALICIOUS

PDF

85.9 KB Created: 2021-09-24 01:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 203d81959b689f0afea0f62cedfea709 SHA-1: 33d443d11004210705d56cafda4ce61f7cc14074 SHA-256: 8a39760b02b5630e73e0446ffdc9ecc51972c10e9f114124f83ff76b93048123
164 Risk Score

Malware Insights

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

The PDF contains JavaScript actions and numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of JavaScript points to T1059.007, and the nature of the document as an attachment suggests T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=catmouse+movie+app+for+android PDF link annotation
    • http://oguraclutch.cn/uploadfile/files/69695202884.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/wepora.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/widubakefulo.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/28dcbdfe228d15fdba06f00158613c92/gijigefivoxuvoxo.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/2facd045cc4a630f03630afd28de437b/76236420556.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339d498238a---vogofofovazezutomarikezit.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210909_003349.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/zesilizezolaw.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/surupomebi.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/lukisuditu.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/jilawasoralawite.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/3fl8hvmc2jio0hovh36hd7ms26/ninejivat.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/nujaralalonu.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f942413514---71121384631.pdfIn PDF document text
    • http://emannsltd.com/userfiles/xekofajap.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021092104122656.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/fibijilona.pdfIn PDF document text
    • http://belovosushi.ru/files/zekexisuvefopuleguzuvaput.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/88825346972.pdfIn PDF document text
    • https://mlspoland.co/files/file/58763097528.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/49445740793.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210921042019.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/7516ff823bb5c951d2452c426e054b2c/70843324503.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/moluvemi.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_off0000e986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE986 10808 bytes
SHA-256: 8c7867e5bd1b2c99b5202bf92b7bf781e7a4604086926f62cfc7c9889baae867
font_01_sfnt_off0001027b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027B 18056 bytes
SHA-256: d0c0e2c8771e5a14d2307bbe05bc0bc71da62a715f28743aa0f422d4e42397da
font_02_sfnt_off0001315e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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