Malicious PDF — malware analysis report

Static analysis result for SHA-256 1982d95eca092c45…

MALICIOUS

PDF

72.3 KB Created: 2021-09-11 22:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99e85d7e9975892e7dcfb4d04bbeaec0 SHA-1: 381460d994bc385061401b66ec72246bca854773 SHA-256: 1982d95eca092c459cd6323fdebe5c94fc0bb1a6a40abe42c714f6ceb691d23b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a link farm pointing to potentially compromised hosting and exhibits characteristics of a callback phishing lure, prompting users to call a phone number for a fabricated issue. No scripts were extracted, but the PDF structure itself suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ixiu-23.com/uploads/files/202108312347073770.pdf In PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/solifamab.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/dopitosanitejav.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161309224c6056---4503202469.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/mobevesuzevobulemosozu.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210905_39564DD4F6016499.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/98214497041.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/70384865037.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/walokate.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210909_847BA8D5640EBF2E.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/karuviduxizinumopalisovij.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/ga51h706d3l73s9e5ounpco2l1/poburopafumazuzelume.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0006cb79a---xebizeduxo.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090518103467.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613292c90efc2---86652991322.pdfIn PDF document text
    • https://path.mn/userfiles/files/vukawofub.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/41023106444.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/ledozuzunidusotavosazo.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/13263298548.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/zizuxibuzateb.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/rorirudeged.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/86829217374.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/2318748066138c7b6ac03c.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/zipijizavuxanojavodamuju.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/50072797058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=iphone+users+be+likePDF 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_off0000baef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEF 10372 bytes
SHA-256: bfd545397f6d7eabbd8a10658dd6851e84d3410028780c57b304ddd42181c30a
font_01_sfnt_off0000d206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA18 16232 bytes
SHA-256: 45c38e5f1a232db96f73d6deddc5ef988de3b521140fe453f036cb8809dcbc94

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