Malicious PDF — malware analysis report

Static analysis result for SHA-256 6653f6c1d83c558f…

MALICIOUS

PDF

83.3 KB Created: 2021-09-08 04:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d83f9b53afd882f77fb427ec3bfe2b3 SHA-1: fb3ff9d9d0e135ebb330c2964d0c09256b5ee991 SHA-256: 6653f6c1d83c558f2d201ec3e82b035cbf616eb201ac2c487abd7c63dcc67b01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Several URLs point to compromised WordPress upload directories, suggesting a potential distribution point for further malicious content. The PDF structure and embedded links are consistent with phishing or credential harvesting lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://macautemple.com/userfiles/file/zonilagukekovamonu.pdf In PDF document text
    • http://erago.cidees.com/uploads/files/davedunibubu.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16111055f23e8d---65884272198.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1612cb61633e96---tulevezufazipedo.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/fbe39ec8203b59a6cff638b1439073ba/tubijukipamekajexi.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/jutowumexarebi.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2db08b0de---wedanisujenejunimuzexo.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9693746ddd---27923839644.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/fazuwekofoxin.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/57d2cb4a132c67605940d9558d822c7d/mutiwuje.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/gunudelanosewababenuku.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/50036199548.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01e2623e46---koguferomolelimetivimo.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/84788758098.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7bdfd64be625ea24c29e46b5e17999de/ginuvazovigulavava.pdfIn PDF document text
    • http://classtool.info/upload/files/muzedoguguxesatemopu.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/75584589976.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/faronijilu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c4566608aae---77544763947.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac6b2e2762---wasavete.pdfIn PDF document text
    • https://temahr.hr/files/litezofatolumogod.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/towozoloranuzuvodafawod.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/45055947976.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7173f67de3---20567071452.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/jexigakifazusewafutak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=whispering+hope+hymn+pdfPDF 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_off0000ddca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCA 19608 bytes
SHA-256: e597b1725058cec42fe6e8def114d2cf6fad1f27e2128d670c8520b07418dec4
font_01_sfnt_off00010f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F45 10748 bytes
SHA-256: acba732b90a456707354afb5111ec377b5785969e149c78a41deb199d2c3d602
font_02_sfnt_off0001278c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1