Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7f8fde96e1e017…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 10:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f32ae815db0db1ed8542f02dfa06be61 SHA-1: 9dfcd26041fdd4eb8c30e983d8b681329034f9a1 SHA-256: ac7f8fde96e1e017bb36818b36d49933c0477d6bf59e041d7c1d726b2059a674
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://bfr-bialapodlaska.pl/userfiles/file/66172116650.pdf In PDF document text
    • http://qqsbg.net/uploads/file/migasozovelaxopuvafe.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/funerewomuj.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/d4gr7r2vej7vsferhdsau820pj/laxiwaraxusi.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5db4c8dcb7028d5d7004f9c0f36c90e9/mulowunuroliwozo.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd678252ed---fulexotubom.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a9106969c---wugiwokasugedoda.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/todikijunovupuk.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/c3a5d0045b80b74ac42432803c726f46/55332024700.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b06f948c136---ladabuvipatazedifidaje.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/xibikiwene.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/85751074784.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/46513182298.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/xotifazunaxaminewabav.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a6610bb3fc3---salomuwadomo.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/xavokibaxizijotowebokejo.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/7423656670.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/96201799425.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/78312356352.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/86957482102.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/genag.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/751c5a01656a84133ab0ac403db97c35/raforubewededakag.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/cdda689977dead93aa9aec5c25559266/depenikorivoki.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/50499833848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=nice+places+to+go+near+mePDF 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_off0000e0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F2 18060 bytes
SHA-256: 5f742bc2460e5fac55ecc51d1037b17ec591ecf7fde799956f28600a93244ac4
font_02_sfnt_off000127ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EC 10696 bytes
SHA-256: 3b3d3e142c2f4cf31a47cfd3f3aee538d591dbaa668dd2414f72978130c4b237

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