Malicious PDF — malware analysis report

Static analysis result for SHA-256 d96e315a84a041f4…

MALICIOUS

PDF

77.4 KB Created: 2021-08-27 04:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b689c1b0834af5013de6a0e6483f4a17 SHA-1: a7cb0f88e24cfec7fb8520c6d51a0af2935de134 SHA-256: d96e315a84a041f48d920155e5f5313db2695d3c32277a4990ee066435b4f85a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms on disposable hosting further supports this assessment. No scripts were extracted, but the overall structure indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://medvor.ru/uplcv?utm_term=indonesian+television+awards+2020 PDF link annotation
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b64b1255067---96155275721.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/54941518603.pdfIn PDF document text
    • http://arslanemlak.com/E/file/19703493760.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/7679141230.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1610fe2b4501df---luretapobirodegujepav.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a6822e41b64fb10870d8056d47478f51/vuvodidenumobagigeji.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caafa5ea88d---ledetizemitureb.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/voramefoxefokepij.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/80289764663.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/57948090241.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/dutitapib.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/68804660094.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/fuxojunifiwugofebexalubob.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/vexaxigasef.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/29742036196.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/jewidedorivexoraxore.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/86d053284122993e24a5f99adda3333a/vorefebipikoji.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/h0pac643dfmionvlrdnm6hurbh/wajeke.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/90620757484.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/52027215783.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/44699082048.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/wivomifovokemesiperopew.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_off0000c78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78B 10584 bytes
SHA-256: a91d69ed6289752396f1cee1de0ba8cd69f16bb448b820d2fe6c58448032d7b8
font_01_sfnt_off0000dff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 18144 bytes
SHA-256: 112fc8828a7d47eac19924a5fd7020cedfe683947ae94dd161255392cf9329c2

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