Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d30121a212fd38…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 15:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 99b14e6f0fab2b7ee0b179ba6f14b2b4 SHA-1: 0c83cc6e0a0425d9d9e025ffe6194adee335cab7 SHA-256: 45d30121a212fd387b72da1ab4e4781f070d3753754a801dabe56fd109fa6fea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards malicious redirection as the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://irlanc.ru/uplcv?utm_term=shortcut+to+size+reddit+pdf PDF link annotation
    • http://www.uc-kushiro.net/images/library/File/18298335259.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070aef049ee8---midaximalamu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c09176be86a---94366246140.pdfIn PDF document text
    • http://newworldss.com/uploads/file/96480765586.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/26339855610.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab47df40516---58711859498.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ujfts6au6nr4c0l4egof6hv95t/35998739248.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609430b2e959c---96570753222.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/lupuzaruzefuku.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606f366159cbe---ruminotibufajoxekaxa.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/beledesurapinagole.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/sigug.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/f3arjl2rouaqfcfvr7f5gfijg4/xikigew.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/kofuxozufurikajukeris.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094e3ce3f708---buwudimokekabo.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/aedjnqvmq2gfkjtmgmmg8sj7at/zuxadimisiz.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/dpnedfm9gh13blvjv3aec1e71c/34072621256.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/77053802373.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/ferujakus.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70f994601e---retemepo.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/zafuririjafuvedalifofupaf.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/78965436388.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/5987ed4ff884d6aab7756f4c4b8abb45/39522253050.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a838064b3c8---bawuf.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608133e65b85e---68809528149.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/63340802448.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611a3b1ba471d---dasanabagorowetoli.pdfIn PDF document text
    • 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_off0000db98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB98 19240 bytes
SHA-256: 5fdc17acd43497b15be6408599dc6f163425f47f1e0828e7be0975d1b3603715
font_01_sfnt_off00010ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA7 10640 bytes
SHA-256: 12ae310c22a24b4dfb5f034d31402681086747becbd8f5b07b8d84329978a6d5
font_02_sfnt_off0001272a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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