Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc033af5e7e2347…

MALICIOUS

PDF

84.1 KB Created: 2021-07-06 14:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 45b905a4725ecadd2e0cb1fe9084c0c2 SHA-1: 67c16ccc41f0a0f890c673bd0dae4421cbaf7212 SHA-256: 9bc033af5e7e23470e274298fbc76ab1326882fc1bf1be83ff20ffd4426e5502
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress sites and other disposable hosting, indicating an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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 http://www.northern-japan.com/image/upload/File/metomemakineroloz.pdf In PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ac185a1aec568c7a98251d52777e6ad0/rogajajovemodosoteselop.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/tobumisurowutunelogeruned.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/pawijul.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/4c48ee795fea34387f50077a9ef5691c/podelaxisovivatono.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/5002712397.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/ravupadasesewufen.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da340b69fc5---josiruvadakogekuwona.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607e05dd2a47f---kobasezuzakuvonid.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/2608fd662f3fbd3df4d60def84fbc1d0/fezutexadojijezen.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6297f45ef69f4220f71ec18cbb2e23e2/37650084686.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/9qrvgs225rt0hsp9d2o9e8dppt/17129963173.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d4875b4074e32e8f0a5ec1001cc4428b/wegewegikikoruzex.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lqkla4lp3b9s06brcqau1tm5d4/31268798879.pdfIn PDF document text
    • http://bwc.lt/i/22880976885.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/67106437642.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e10fe9475---foresawuxelilav.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/magasamuvobuweda.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/66169220321.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b5e58df4b---digemekovi.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210619230922.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/f4b0be1201b00165b40ed69bb31331c2/xivozarofokajotimige.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e8a638d17---rezazapokiwobofelote.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/47298093034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=2nd+puc+accountancy+model+question+paper+2020+with+answerPDF 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_off0000e00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00D 11372 bytes
SHA-256: 2125a2031dff4c8bb0c5fa54622c1784e9e9affa9464664aa85a6c2b1a4a9dc8
font_01_sfnt_off0000fa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA82 18204 bytes
SHA-256: 1ed8a2f7268cf60f719873712d148d9a1f7dc11ea502bf7c36865f98d2b12e78
font_02_sfnt_off00012a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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