Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8ea981af10adfe…

MALICIOUS

PDF

84.3 KB Created: 2021-09-23 22:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8bc67d2494ea70b2446f3a7fac3b297e SHA-1: 9b6f52526eccfcd215f1d8e1eb2fafbbb1408fd3 SHA-256: fc8ea981af10adfe6658feb719766a7ce1fa5bec302218d0ff0122573431997e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://philabc.ru/uplcv?utm_term=you+will+die+at+20+watch+online+free PDF link annotation
    • http://studioesflores.pl/obrazy/file/wufer.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/fegujasa.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/15534756161.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/58979986006.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/50820111677.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/somuwuzapilapuvevowutop.pdfIn PDF document text
    • http://htygroup.com/upload/files/texukuvedakovoxuzeso.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/fasokupovuwolovu.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/xigukuxegowudafejakesit.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/99912836262.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/67323387480.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/rixafex.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/34625693271.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145812e3ba0b---92842444445.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161353e367aa0a---65929270751.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/bajoxinotepajawutur.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/xifedewigujideliro.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/39409917815.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/5178056463.pdfIn PDF document text
    • http://santeh.md/img/files/53217457662.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/defof.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/konawu.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/jisozakokisox.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/sukode.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/kituragubokun.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/oegfs1mr4v662h31v7pn1u0k7f/44104266550.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_off0000e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE334 18168 bytes
SHA-256: 00f36f92fe1d5f105999f59be58e23b2fc29b748c66c931a96cae624b3ad9110
font_01_sfnt_off00011239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11239 10816 bytes
SHA-256: 305abd4cae09f2ae1d28d54b712ca4afb3774f02cc4f039f680620a379e2477c
font_02_sfnt_off00012b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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