Malicious PDF — malware analysis report

Static analysis result for SHA-256 4170c35add04ff46…

MALICIOUS

PDF

113.2 KB Created: 2021-06-11 19:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5352c0b58e9a97df3b6e5b3f4bc8f495 SHA-1: 643c72d639e188005d6eb180f87df9582a81e723 SHA-256: 4170c35add04ff46a0261fdc13b46695a3a5ef6cf79ee4d23c456e29005d17d0
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=parallel+lines+cut+by+transversal+answer+key PDF link annotation
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/0d7a38d7b1e15ea112bc89d8663b37ff/20434124061.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/85411975937.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f327ca3f---wunekowilidegunofowir.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5226e46b2---gegizadop.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/6u41lkmd6j3pll7co7cvgu2b76/temozosuverawixenumonu.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/waxojowidorunevukibirapej.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/bcfe13ffabbf234738c8b200ad360e5f/12002234169.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/4of9fnbu70lv8eks0vr6379cr6/97791654989.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e028c8337f---12228208099.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/ginamit.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823ced99653---sabazotokurezipogemeziwo.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160856b28e6caf---7844941947.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/13396044627.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/64e1b028c548a5b40e58cdeb54eae927/7167254217.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/50821471437.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/6b38de92667375c0b9dedbfe4d8d77e6/74109446017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000155c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155C3 5024 bytes
SHA-256: deaf9f053b7191257ecc7bd17285498dad262340fbfad57f3ad0fb0799650c45
font_01_sfnt_off000166f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166F5 12388 bytes
SHA-256: 87dd4b20b5aff33ab378190c265192469c1919f91e5f7a519e733cfc7c1f6b5f
font_02_sfnt_off00019144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19144 16368 bytes
SHA-256: 8e288eb19736927ba58ba090fa06a46a62cf85d2f33c7eed9858e98748d3ddfd
font_03_sfnt_off0001a753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A753 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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