Malicious PDF — malware analysis report

Static analysis result for SHA-256 fddf37414df649b8…

MALICIOUS

PDF

78.1 KB Created: 2021-09-10 21:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 90491ca8c79ab9fb2bb33c7c04cedda2 SHA-1: 713bdc6712f015dc8f8e381d4a8457889a7b15ee SHA-256: fddf37414df649b8bc8636b0f8ee87e0a656632cfde3e155a108caaa001d13d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161303405406bf---64953368427.pdf In PDF document text
    • http://levakov132.ru/userfiles/file/punuzepogirirolaran.pdfIn PDF document text
    • http://jljemc.com/upload/files/99053328457.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/kefetedajopowo.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/40140734800.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/dedekalonikow.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/41791122094.pdfIn PDF document text
    • http://ymmicro.com/files/files/kilowamotanasavanet.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/fotaxuzimotiduba.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/janibafibagizelat.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/66178459348.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/pozulixagaxegexoxotagaz.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/3572563330.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/xekelozurimufenafozudik.pdfIn PDF document text
    • https://mkontroll.hu/File/13527394951.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/wisowu.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/27034084874.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/lovexumisekinijega.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/26036828837.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312a266635b---22010500178.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/forofejaposakafogufi.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/d29987fb58b3f7b2414091080bcd6580/mavatoladafafabojomo.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/fatilelofas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=daddys+home+2+full+movie+online+freePDF 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_off0000ca9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9D 10920 bytes
SHA-256: fb9416b9f1668372baabdeffbdebd25e5931d683abf8b3e056cf2b6c4abb1211
font_01_sfnt_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 17904 bytes
SHA-256: 6cbde5a94b60527f3029f9c9ce66b7392d04ec0afa422b28fc957082cac33654
font_02_sfnt_off000112c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1