Malicious PDF — malware analysis report

Static analysis result for SHA-256 97eb0e0de0d6a41a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 09:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b39e82d73e311354f85f979c3a4ed42d SHA-1: b8ca565ae2f56974c49bcadd6d5ea3f881f12e03 SHA-256: 97eb0e0de0d6a41aff942e0615b049df768ec049831f46fbb258adcf5caa1b65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, containing numerous embedded URLs pointing to compromised websites and disposable domains. These links are likely intended to lure users into clicking them, potentially leading to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jaika.in/images/documents/files/7109619975.pdf In PDF document text
    • http://curry-box-deluxe.de/userfiles/file/19563827760.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2372a50a1---48177528447.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d46e65001---64292840285.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/nujotivikutepovorazodoko.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/76206010076.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/68261197417.pdfIn PDF document text
    • https://maria-galland.ru/files/file/94169818520.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/39464074115.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/degerosuj.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/13785444308.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/75887208761.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/35g718jssnd2a5bjiocas63t47/96081480141.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/54492889291.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/77607fc4264ad6749b211adc9658ac14/virobegizajelatotonu.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/logemoperu.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/151616088319.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28db3c75d6---55042755812.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6160e1935---99533051382.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86479449439.pdfIn PDF document text
    • https://shibbirs.com/media/files/85627368177.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/96119495545.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160886c039f95a---mubesafed.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/sajawujixu.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/kefadodazidibu.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/108f1d0474ead3577e1709ec8f6d98bb/dukelimiwifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=list+of+countries+in+africa+and+their+capitals+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_off0000da53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 18276 bytes
SHA-256: 8231fe4c530cec259b0351d603c5c86198617c1ff2bd3ccfc2c9392c2ca517d5
font_01_sfnt_off000109e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FC 10776 bytes
SHA-256: d0dfcb65b54cd1ff709de3890d90cd57633925f38f92e2b2da1fbd6005faeacb

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