Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3d63fc75955999…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 12:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 210c4808fc8656b7ca056428fb6d43ac SHA-1: 1e6680893cce1189860d32842a159045bd9345d6 SHA-256: 0f3d63fc759559995de016fd98950428429dd10faf668024e03153fe5e58aa33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm that directs users to various websites, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://hpworld.hu/data/pic/Image/file/gajed.pdf In PDF document text
    • http://obkladacstvikolar.com/content/monunekomarekitokego.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/6d75f03739b609526af4dd6aed748a2b/rijeruvumisi.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/xesukimigamafa.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/zenebobasezifimanu.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/37276240772.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/78673375650.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-5/20210905042828724963.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/67929128024.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/55607245703.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/fekezebibe.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/65098831455.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408da964798---76753328380.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/roxipiz.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/16347090736.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/fopom.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/78496832520.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/lepepadaxavoselowu.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/2053e405bd0e5de0aee8416fae84a33b/93139069654.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/98070642853.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109122022529308.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/51929580103.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/podasixefususabikobatowur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=interstellar+watch+onlinePDF 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_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 17844 bytes
SHA-256: 4c1743c69d0dcd005c76d89de2e194a5532402328c4b5719eb4590e26a71d79d
font_02_sfnt_off0001210d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210D 10364 bytes
SHA-256: 902a7c9dc2ee1ea1ba719b2172c5cacb64ac06944f3665e188a9532309046f25