Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cee023b43de1d7…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 12:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 67bf7cef5ed6c3070440dfd950d80154 SHA-1: b7d629caaff25a80d473fc8d9882d39aef75c880 SHA-256: 86cee023b43de1d74906c5c8af9645b6678607353dc6ae0d5f5213af3b794d11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The presence of numerous links pointing to compromised CMS upload storage and disposable hosting, combined with a specific URL containing 'ios app store download for pc', strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm and phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=ios+app+store+download+for+pc PDF link annotation
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c0b995e9e---dukerosomejurun.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/voxag.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/10913688267.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/xogopobatabuveguf.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/kaposufufogolezuron.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210907_155022.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/88294356943.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/64255f1a874c208db54f85bc24d577c3/47265052606.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/24975949848.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131550683ba4---38931251012.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/27512128716.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/99136024729.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/15882115260.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/11749977145.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210902_7135A95DD2ADB9F4.pdfIn PDF document text
    • https://aromamarketing.md/img/files/33720994529.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/62824410122.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/delofunoxarowerunadi.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/94691836646.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135871a48a58---titalagosi.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/71086166880.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/73493117394.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a3b2931d99c9ffee64c16d6439586b9c/61181166973.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/69267757086.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_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 17980 bytes
SHA-256: 71228fc298b769aba05b2783b565e0ca4ae705a575b382c6bf2459dcf14bacfd
font_01_sfnt_off0001116a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116A 10560 bytes
SHA-256: 71df7a91831a213f4f8606b8d2d472147b861cf74e3e29dd6a16d73dbaeee02a
font_02_sfnt_off000129b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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