Malicious PDF — malware analysis report

Static analysis result for SHA-256 7320f96abcdc4e5d…

MALICIOUS

PDF

92.6 KB Created: 2021-09-19 23:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b891d995c3d64c9f37a08e9cef641cb SHA-1: 3f9164a3a685861984e8f695e7897c2342583358 SHA-256: 7320f96abcdc4e5d78baca0eabff0596ba50a4869cbae100107adfb7fbb1a06b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://nikolsbeauty.com/webroot/f/uploads/file/dusopodesit.pdf In PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/77a7645e670e4188289348396d4ae2e1/2306455099.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/61714189831.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/regemelobutero.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/fasabofagodelope.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/puburudebatiwofaxa.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/41134192473.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130c69cd567d---25378659468.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/8690c9d751c4ef4b8521dafcac912b13/91386620557.pdfIn PDF document text
    • http://indemo.pl/Image/files/megolemavosipusasek.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/luxarudifigunegizuk.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/36069813910.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109120100309245.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/kipotaw.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139a4ebdaa89---65938762648.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/5088710778.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/17240297073.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/65907515453.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/75674354324.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/givugiredaboloxamaja.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/vogovog.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/jibaboneferufujub.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/gudowobixebimejifaxomat.pdfIn PDF document text
    • http://888chji.com/userfiles/files/motoxatavedodevij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+compile+flutter+for+iosPDF 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_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 10552 bytes
SHA-256: 86bd42eb38c4a32e998d732db3a9b7313a3e8cb2799f9b7a793d470d2b14c7d9
font_01_sfnt_off00011e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001365d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365D 17732 bytes
SHA-256: 3bd2ce5fac37a64c50744231921f0f4e8f670bd9f2c9029aa9b7a19522909651