Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6341a8ef2858dd3…

MALICIOUS

PDF

86.3 KB Created: 2021-09-06 08:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e056524574f4710c547400bbdc369a65 SHA-1: bfb3cc59e89c7fdd42d25c74c3bb39a28555f264 SHA-256: e6341a8ef2858dd3ca348d8a93a40a14f350a54590a0d383aab91a89301d20b8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains associated with compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external sites.

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://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c870312c4d8---vifepusowutigob.pdf In PDF document text
    • http://cdkkck.com/uploadfile/file/20210602203619.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/zawukabesudezuponibuf.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/fokumonesosakuligek.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/750bbf4080e477c73758a2b158323865/18118128954.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ccrtngdml47i3m5849gc0dgs4c/gomaledudifunar.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/9rpclc1mbicrafo07g1sve7t2s/gutamufaj.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/da22fcab5ddb2a17765d082661b92e0f/87848796849.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/12148034409.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11cea55689---24617068655.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/1001003813.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3087a0e7a---bilasa.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/37712907779.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/sidofobifadafanow.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/pesixufukinipegeromaxe.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ac2e48903243fbe01a202bc8d671dcbf/tutikalelo.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/39268447295.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/20015988416.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/dca0266609450be2332f4525d8c786a6/48455368173.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f448b4c4f19c2d45e1431130bf4a41be/95895568.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/zukixafejagulazixonak.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ae056cf36---maxavi.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff5540a9ce---rodesub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=multiple+choice+test+in+english+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708238bb02f---kiwigexega.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_off0000ea9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 18312 bytes
SHA-256: fcde027df115ad4faa63ebd55ffe8d2dc5e922087f6f62458e1ab842ed82e396
font_02_sfnt_off00013307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13307 10728 bytes
SHA-256: 6669f34b6fb83d5f6e42c6cee28dc2cc7789af3e83cdedcd35f3572107fdf4cd

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