Malicious PDF — malware analysis report

Static analysis result for SHA-256 f151ff73fc064350…

MALICIOUS

PDF

72.8 KB Created: 2021-09-09 07:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b8c078c9c879de613487d27f39520c37 SHA-1: 08650fd4e4921eb6db08ef7feaad2243b63caeda SHA-256: f151ff73fc064350fc6b65d76eeeec65cd1a13222512e2a5ef9a411870c461c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=android+file+manager+windows PDF link annotation
    • https://northcoteplaza.com/userfiles/file/19373335411.pdfIn PDF document text
    • http://swhos.com/upload/files/tujemuge.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137df0d98f04---10705659524.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/7980777392.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/19693016978.pdfIn PDF document text
    • http://shopabrang.com/images/files/jedolafobex.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/65599674843.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/jisawatiruleruzakamitin.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613382dc0dc1d---7458032045.pdfIn PDF document text
    • https://samowar.ch/upload/file/dafanudutikodeworoxozes.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/ritezavased.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/21911230188.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/tamotopavevinodenowupetip.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/23034809619.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/93820352790.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613987b77d834---pagulatida.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/xegupatigimokox.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/vikepujinurujoxopukefaw.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/rosaginak.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/65328525389.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/sebopebizigel.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138607eb064c---dunolupivelutipebotupor.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161353f0cbbb1d---sodibubadojifipekavokilol.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/sutozixameruxivimenise.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/53464269625.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_off0000bc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5A 10668 bytes
SHA-256: 1e198eaf93caa4e5782a55ddbfd43d02c9cd5a7954d2bb47c318eac5ee9c0340
font_01_sfnt_off0000d49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 16228 bytes
SHA-256: 6bfaa4c6b734ba0f8f5b172c4c65ff4152d4a36f846df690d05f847833256f66

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