Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d348202507b6f9d…

MALICIOUS

PDF

77.8 KB Created: 2021-09-16 07:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f394e2bd8c8829895ef8cf23fee8208 SHA-1: 61c50138397fd5a8c7e89435551f73b309430389 SHA-256: 6d348202507b6f9dee4fb3e791351bb9c97902c5de46f1e5cefa37b1e385047d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://inwestorfinanse.pl/userfiles/file/todiwejemutitumogixam.pdf In PDF document text
    • http://erbaytag.com/resimler/files/vakejewubim.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/bdcebffcc9e0f9054996edc87d0436a7/70093490328.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/tonijofived.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/jenukomumopumof.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/4744743068.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161421e9767436---72453240971.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/67966367652.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/duroboganekaf.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/d42fa9fd5fa81f2be386db89631c7272/71120535465.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/taxumejidimokizudilubikot.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/72924431258.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/jarexolemururotisebeje.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/88385081062.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/37449330902.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/zaserimevipedala.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-14/20210914185025598642.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360dd7bad20---6690131613.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/85199897443.pdfIn PDF document text
    • http://teplospectr.ru/images/files/gezewasusagive.pdfIn PDF document text
    • http://irinabailey.com/upload/files/sorifatukulebom.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161347a765887e---37065287888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=freer+instagram+viewsPDF link annotation
    • 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_off0000cdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEA 10416 bytes
SHA-256: 6181721fa656a14ca45db00604fc8cf82f447dd969e8f697f529d5bf9a99f742
font_01_sfnt_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 17144 bytes
SHA-256: b6a44225e6d3a6ba4370c64d50bd6785132a62cf1464567c2abaed5eac6e681f

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