Malicious PDF — malware analysis report

Static analysis result for SHA-256 d164235dd50a878a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 01:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6ccfb3c41c77e310013a1efbaa1d4a14 SHA-1: adfd481da7e6b33d34cdddfc278cd9e5d9e88dc0 SHA-256: d164235dd50a878ab0015396569da8b26800fe411f8f1931752b1d0c73cf9656
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • 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
  • 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://garglob.ru/uplcv?utm_term=mazda+2+2012+repair+manual PDF link annotation
    • http://mutamobilya.com/images_upload/files/jevulorinifebemudetafugan.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/a7a483680bcfce81390589f409c252bf/bemir.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/9272759793.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/e7f02c8903205876b06843a66a66dd1a/5828277909.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/1330390417cfe9562119929fc96e025e/lidopen.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/84762247402.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/46579229201.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/b370c50a3490c410e9723e00346b39c2/13387959605.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/vopofikegu.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/muwofuni.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/2923077751.pdfIn PDF document text
    • https://digireg.gr/upload/rakijibivajeliramuzeboja.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/68140432050.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/20339158955.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/27459416527.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/lugopalesax.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/98199791974.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210810100352.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/56953102761.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/pukowifunibemuwamat.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/dexowar.pdfIn PDF document text
    • http://candientushinko.com/images/file/zosiwomilinonalev.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/81882857847.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61ccc67b50---35886155243.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/taxat.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/82478576902.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/53499983501.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_off0000dcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBD 17740 bytes
SHA-256: a2f7a319922a6bdfef86fde694b84ccbd65fcb5d7933dc4cfd85d9f5f4cbddbd
font_01_sfnt_off00010abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABC 10612 bytes
SHA-256: 02b6702a899a94d338e4fa55be9247d5bfbc5ac72e802ee041299f85ad7c6027
font_02_sfnt_off000122f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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