Malicious PDF — malware analysis report

Static analysis result for SHA-256 924307663480f559…

MALICIOUS

PDF

101.9 KB Created: 2021-09-16 11:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 71cf3e8fd6aed946c26da91d9b1183e2 SHA-1: ac7da416e08dea3b0ed06df75ce16ee317f6bac4 SHA-256: 924307663480f559fb50f416975b7365064243158dcf17cf546a95d531a6538b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a malicious PDF detected by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. One URL, 'https://ketchas.ru/uplcv?utm_term=vector+apk+download+full+version', is particularly suspicious, indicating a potential lure for downloading malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ketchas.ru/uplcv?utm_term=vector+apk+download+full+version PDF link annotation
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/wifegag.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/pejuzidenenipogijagerikuv.pdfIn PDF document text
    • https://fratellifurloni.it/file/wonudewetevudelas.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///nonirotetowo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/9cmuh2nsehovcpv7ia7rdetp8j/dotuxetutolisuzitepefo.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/77712302104.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/zuzugarekeberiba.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9d908909a---52879384434.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/20219495137.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613363ed337e5---susoguwobu.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/78379975888.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/zodafaxonujusazo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136113c3561b---sitakelisivun.pdfIn PDF document text
    • https://intersat.lv/files/file/vonadivorivezevavotenup.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/663f084f07f80970ddb96e73ac7f52a0/63307383696.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/vmau453r0sal2qug65hrj5nsl3/fuzavirejogesojazerix.pdfIn PDF document text
    • https://hkki.org/userfiles/files/monirinokavi.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/42803601601.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/32234739697.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/zazufogiwexo.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/6891624581.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1614011c0b0126---lenujilas.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/48742908811.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_off000124ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EF 10928 bytes
SHA-256: fdd8bbe2e4dca51c28883816c2fba0d064b6f6b3e7332103a89f151e797697d1
font_01_sfnt_off00013e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6E 19464 bytes
SHA-256: 7dced899bc26cfa984e94254180fd2e8265686ad73e4f4364f6d0c57a4da93bb
font_02_sfnt_off000171c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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