Malicious PDF — malware analysis report

Static analysis result for SHA-256 305760138e133c7c…

MALICIOUS

PDF

71.1 KB Created: 2021-09-23 18:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae858e22b22639f0bfbab5057e8ad6ab SHA-1: 10a93e87d815206bc52f1c75689ae6f7a1c362c2 SHA-256: 305760138e133c7ceec8261673bd89e13d3dda5cb290cd252b0b6bd0658e7862
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://oniceh.ru/uplcv?utm_term=tv+sport+hd+tennis PDF link annotation
    • https://shatalarab-llc.net/userfiles/files/60837374279.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614750220fafe---namazitolezudojotimug.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/vuwuwetedirulugu.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/xopitebezotakutudoxuvol.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/27342736400.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/niwigitibiganune.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/64261362958.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/63738502159.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/79c371d914761b2d5d48a50892c3f12e/tupijisokadisi.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210923041411446214i59g7afgzg5x.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/pofoxamuzovawutijekufufew.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16138a29515f7d---77888366833.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/fepopomurabekasizat.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/vamis.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/30275527045.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/86877894801.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/78284275410.pdfIn PDF document text
    • http://xn--2-7sbddqrtdw3be6jua.xn--p1ai/userfiles/file/fifogarixo.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/napuvobalotugakasepoz.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/55788125318.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210902232423.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/biralafigojavo.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/54992174376.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/xumibixarutikofetosave.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/24168974656.pdfIn PDF document text
    • http://chinazzjx.com/d/files/42893739393.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_off0000b6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBF 16104 bytes
SHA-256: 7b829957952a30387bb0f24e0eba2c89b1e8401b0931445861c9444a8559cdcd
font_02_sfnt_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 10312 bytes
SHA-256: 4825c62fd4212aab381927ea2296dd388a24f05f554e974bcd99ce1d320e8c9e

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