Malicious PDF — malware analysis report

Static analysis result for SHA-256 752497bcb6b78b76…

MALICIOUS

PDF

76.3 KB Created: 2021-09-15 06:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 7c83088a655cf2d7ca716e0e8a3b419e SHA-1: dc3b708d9616bbc7df644444158e02ef5437b190 SHA-256: 752497bcb6b78b76365bad132e33b04b9a612c328f6a203f0c9ad6bc59160fd7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and exhibits characteristics of a link farm, with many pointing to disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nomylo.ru/uplcv?utm_term=how+to+check+wifi+password+android+phone PDF link annotation
    • http://hzkontejnery.cz/ckfinder/userfiles/files/dinulepomefebonurovaz.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/zumowevawewovapare.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161413e96aee83---mirizivar.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/22943563837.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/tabitafin.pdfIn PDF document text
    • http://18554080.com/userfiles/file/roxesusetakapipemakefozu.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/15340565924.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/vagaruluxode.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/c9c17f2bacadfd547fa19b20388fd4d6/tuwafo.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/rhvuu1m3i21tkeqa5rs6d9f3ms/jawuretexaz.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/ligadubifa.pdfIn PDF document text
    • http://kco.su/userfiles/file/borapoja.pdfIn PDF document text
    • https://pecsikult.hu/files/file/pikufexilagone.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/91711677308.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109090936111003.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/74362091271.pdfIn PDF document text
    • http://adice-area.com/pictures/files/dubakedofimedenuvewi.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/bujunepas.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/lomiroturanegojati.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/patigos.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141639e2216f---47553442986.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/43739822725.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/pefopoxowov.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/68907781852.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/5673066933.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_off0000c43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43C 10840 bytes
SHA-256: 44b3275267a0bb61b74b7d2a129eb095b111c1ab0b3c125ad41d207833240574
font_01_sfnt_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 17816 bytes
SHA-256: 8e9ebac93dd8b8114efc3bc893e1a2a5ea98f7ab9b56bb61f8c541d870b2d668

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