Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7764fc931fa4a1c…

MALICIOUS

PDF

93.3 KB Created: 2021-07-01 14:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 51cb3269a9ceaeadcb6626b2b23dac6b SHA-1: 0b68b2cb889596421e1e64ee8cc06c5417a1a00f SHA-256: c7764fc931fa4a1c041c0408070c0845cc7ebfad6ce77f88e77e2167a9650fcd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://alphasigmaoverseas.com/userfiles/file/fidemut.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/tp1dqs0deepdmmuj5adikqrco4/83203537479.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/43003594429.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9177b671d---fexebupaloduzimitogidudob.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/jakudejot.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608ce0f5add2f---84256262061.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/10356824119.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfc64dfd1f---53634214843.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/ruvevedobotixokuzizixuz.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/5hok1e0ttbehqm86u6iu8cmkaf/12657980687.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/380858719.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acdabf42031---diroborakevar.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160833cd43161c---sinekaworiwilokegilovo.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/vuzekiwirelede.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/91824684117.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/xidet.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/58360807379.pdfIn PDF document text
    • https://ak-oroslavje.hr/files/96169848998.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ikuln4assgdl8nb5699ee2suoq/wilaximujesaxabokovuviki.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c756e3e3c19---monalijelibijekuta.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c22c5b0ac8303e49c3ff40c7c83df026/7704965340.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/tejopuwetaxirumatizip.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/wakigadazud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=sample+answers+of+interview+questionsPDF 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_off0001078c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9E 17784 bytes
SHA-256: b54e7266850fe18fe641056f028cfe5522d72f6203586daf3371c283b7e5cb63
font_02_sfnt_off00014e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E43 10992 bytes
SHA-256: 79ef9d61ea3a601054c9c51f41e4ead9f8e36e8c6efca63e864f7d9c0247ad63