Malicious PDF — malware analysis report

Static analysis result for SHA-256 f451f19d8874fb52…

MALICIOUS

PDF

73.5 KB Created: 2021-10-01 05:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6a8cf6703fe6bab8dac267c52c23bce3 SHA-1: 0df0525df7aa5d1d9d842e982f215bfdce6d629d SHA-256: f451f19d8874fb52ed66af69a86b157ab43dedbd72c1749ef5fc8d52b60bcd9b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with spearphishing attachments used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://rumahbaruku.com/contents/files/8041438275.pdf In PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/71a941209423b846d5b772f64f230dc7/delopajepinitinulepa.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/83601288524.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/48350263832.pdfIn PDF document text
    • https://ulsantour.com/FileData/ckfinder/files/20210917_51BD04A44F4C3E50.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/beridis.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614671e565b04---67566588139.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613073b955ffb---gurasexez.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/jilogejinun.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac804870d3---dexojisagenilas.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/nuzerukadi.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/140819331884.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/11458399659.pdfIn PDF document text
    • https://cmf8.ir/data/file/monemaputep.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/lavavumitotifagexorobas.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/e980b3c5163b34f51866dc3c6d83bf85/wezizibadubugilul.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/65446353309.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/80413330395.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/wifemubopunizoradifatud.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109221811071951.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/10612217221.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/61484594345.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/19560400601.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307f84df2fa---wefatonakakelogegamilov.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/puwunalobananuvimolasudex.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/54453582954.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/12775179218.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/20oqkjlpnpk664vv61q5qf5s87/zerobofisaxolumisevezadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=a1396+ipad+price+in+pakistanPDF 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_off0000bad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD1 17100 bytes
SHA-256: d79258eb8d2187a873ebd9f20686b94523648e080aa07c460acc8c8f4310c380
font_01_sfnt_off0000e66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE85 10976 bytes
SHA-256: 1468369a5d753f0086cb5b864e9b158ba0ec6bb149d4a3a4b8cb9a387f09cbe1

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