Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d906a549c8bb862…

MALICIOUS

PDF

74.7 KB Created: 2021-07-05 02:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 686114cd52b2ad4ac46dab63388d2cb9 SHA-1: a438ce38754684c7a2c0e03ddf3ee34bd1be4b2a SHA-256: 5d906a549c8bb862de1baad6ca9f9ad7447961208eb9bb21a18e6bb094e52513
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to direct users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8616f38bf---xaluvipumesizi.pdf In PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/2ec2a49a00d82bcaf907a6e13c5090e4/jisoj.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/95810326332.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/20995372999.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/12783127359.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/7823571888.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/ribopepura.pdfIn PDF document text
    • http://bienbao.net/uploads/files/penamixilupasodigejedoka.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac86d9f380e---rotezawujafaralixetidu.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/51632620941.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/siwudatejuv.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d66ac153f15---20868665217.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/8un9k5i9d6sebkv72cvp26jb68/dozuwasumazuli.pdfIn PDF document text
    • http://i-biohealth.com/files/labogejosibomatumuzitiw.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/b83b1dd7a58d0c3984d2c57bccb48727/34875795875.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/pumuzodunavowe.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/lanivozuxefulikesu.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/xojadeven.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/41583178894.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/1f5obhhtaqquh8gedfb61tn5u1/85024779968.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/92661399343.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/3cb1j8535hohst4ph5n35mmdms/54147946409.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/32134240786.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/19995883716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+lobster+shack+at+two+lightsPDF 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_off0000c26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA81 16352 bytes
SHA-256: c218c1994c9bf269d493478f97a7c73ccf3c7b20d5cb6b92b3618bc44aec9277
font_02_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 10684 bytes
SHA-256: c1dae4281ac096ea7a7cf599b3759cabf47a601da4b8da3c7dbceb0ee5cc1296

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