Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8399ef4a6fbede8…

MALICIOUS

PDF

78.5 KB Created: 2021-09-13 23:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 50e100960fd28e510a4b6d07ca2b902a SHA-1: 8b156174fae943387fec967fab426a116fea29ad SHA-256: a8399ef4a6fbede86c019a9566568ba5a164c93c9b81c9eb5c406edf7875f8f9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, with several pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://philabc.ru/uplcv?utm_term=mi+forum+redmi+note+8 PDF link annotation
    • http://tuecpa.com/file_media/file_image/file/sizoxiradupujawax.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/nedimopufoga.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f38bedbddb---21404749779.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/morodepudaxome.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161392113712cd---wefavanizesusurevegijaxa.pdfIn PDF document text
    • https://parc-hotel.info/file/vedan.pdfIn macro / runtime command snippet
    • http://jshtextile.com/UserFiles/file///luxiri.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/42430210458.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/sudumuvenigipifumoke.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/pitonigunobawidojemim.pdfIn PDF document text
    • http://mylodge-naoshima.com/51068613198.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/nujibimapeke.pdfIn PDF document text
    • http://healthywithhart.com/res/file/kegojerobexakiburis.pdfIn PDF document text
    • http://camonetinternational.com/files/file/39274540929.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/kokolutep.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/nulula.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/siwumilakesupiwil.pdfIn PDF document text
    • http://baoveantam.org/upload/files/47632290254.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/45943787a69f7af758d11e4e0c5b92ec/75253973843.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/27027927700.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/fefokeloduvekagi.pdfIn PDF document text
    • https://www.ferienhoIn macro / runtime command snippet
    • 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_off0000c630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC630 10440 bytes
SHA-256: c02e3ceaaa252a41a0f5096d0dd23896b86304574143e0a5e644e5346a67aa4c
font_01_sfnt_off0000dddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDD 21224 bytes
SHA-256: 8cbaca5d7c577444718c2d489e7ad36016bc3f9be2c31e602e10a061d0cf6137
font_02_sfnt_off0001152a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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