Malicious PDF — malware analysis report

Static analysis result for SHA-256 6799b22ae13e998e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-12 23:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0187dc12f4a8af04785394e3308858e6 SHA-1: 0ca7eb6f120b89746dc6f94e1ab2aa6ce5e20729 SHA-256: 6799b22ae13e998e5387be6bb338221188402ec80a35d8c86b3e61e6cdcbc7db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports a lure-based attack pattern. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure point towards a potential exploit or a download mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=baldi+field+trip+apk PDF link annotation
    • http://picassogift.com/Uploadfiles/files/xesoperepixukorixene.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rkm4gt0mmc7hhk4vehfn2enrfn/gupavejanag.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/82388212520.pdfIn PDF document text
    • https://fratellifurloni.it/file/73132594824.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/oe36he15d14v1gjditdnics2nc/94917293666.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/95342511556.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/57640066992.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/73723093390.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/tujorafetufalidefafo.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/xasofifigokudavot.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/54947846999.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/4962350772.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/94996940562.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/87524923055.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/48960498707.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/rejuwu.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/suwuvomunolovineruxaje.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/rofigi.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/juxatujizu.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/68323968966.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/zajaruta.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/0mldpfk6c9u3u98dqhco8babkn/donobopozegosabisewero.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/26535662839.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8de0e44b06ede8f6250e301a73a54508/bekaj.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/mobarisa.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_off0000ced4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E6 17340 bytes
SHA-256: e0b3469f51092d49a5325b25e0e5251df7bdaac6bf02b5623016b95e748fe507
font_02_sfnt_off0001144e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144E 10244 bytes
SHA-256: 6361fcf91b724eaeda25be2a90c0e0a82756dc599555146e6609c590a930cb78

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