Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c23ed108f1b841…

MALICIOUS

PDF

78.8 KB Created: 2021-09-08 21:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7490d99ceaa375e107ded9dd3ac3c0d7 SHA-1: a698f8f8d026e9437b072062aa9c3fb5686d259e SHA-256: f7c23ed108f1b84126b42d84b7678d8fc6022666936b1d27936d42f03ebdde7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious destinations. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to leverage search engine optimization and compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://queure.ru/uplcv?utm_term=laudo+pericial+judicial+pdf PDF link annotation
    • http://ledins.lv/cms/file/8322225209.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/lexafenetewixafav.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/3hmk7q0cs64n9cvsr9cgspisc2/70177516206.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/46482742170.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/36b42b333a64698d7373a87f4efa4100/boxunolazapi.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/99100277456.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/86131603959.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa868aace5cc95e7cbdae33aadda8656/nitejapifalajogale.pdfIn PDF document text
    • http://hkwwta.org/userfiles/93488674344.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/gapab.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/gifokubemapakaroxa.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/xabaguzuwodumudowanogex.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/poqcvqah6mp8jo3ldvpadp7bl2/45774353815.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/65557769449.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210906023104.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161322f6a7405b---nujigodakabexo.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210905001027.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330e7f891a3---pogemubupitamuza.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/77030795964.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/xotebixoforukukodapipedu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134068a19f72---41810295969.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/nexobeguvujabubajusaram.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/qcqjarrs179qdiirls997nbvk1/rupazojiduboxawotineji.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_off0000cf1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1A 10428 bytes
SHA-256: 49eacd845d045ff0ed96e1e40868e12eaf63942272d434eed99f471e713143c9
font_01_sfnt_off0000e6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 18080 bytes
SHA-256: fd4db806c31edd99d7c092ca18b7ee294d1de8fc4858ecd2cc597e7fd7c58008
font_02_sfnt_off00011554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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