Malicious PDF — malware analysis report

Static analysis result for SHA-256 291b3c9f2f9b6e43…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 06:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 090701f220daf2a8cdc8de315cad1899 SHA-1: eaec11388f5f56982b5ab549d3e8897f5f76f1de SHA-256: 291b3c9f2f9b6e43bb321d7b0aa3717fef7ab4605f1064c73449d439a5ab551e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://kurishupally.org/userfiles/file/24304540461.pdf In PDF document text
    • https://hockeymro.ca/docs/file/58168634424.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/6766655810.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/sivojokan.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/3e6846f8d2b67e80e0fe8e08c49067d7/37037266383.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/71675416377.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/20665775628.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/96210775253.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/94297588867.pdfIn PDF document text
    • http://phongkhamtamthan.net/uploadeditor/files/golafepunewepodesonigajuz.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/0ad70bb751e702334d09fbcd420d2157/kurimum.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/099ba26c7a32379b8a09cf6c23f3e40f/pororedusawosajez.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/63302161755.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/pokam.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/n3ed7fj3ojv6gaatnf91dg1990/mofivupidegojo.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/dowelidijex.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/zoxevadolada.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1611e8c3028211---36210532988.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075439445a08---54675940562.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/30648281204.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/mjkendejbh8beigccvikhr5opc/18250172203.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/275034ed3d32e5726b482413ac61584b/temagogij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=detailed+lesson+plan+science+pdfPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/bivodexik.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_off0000e243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE243 17256 bytes
SHA-256: 6850ef1aadc7faaf228fa95297e6b4f38ba9bbf2d644ccff3d7ad78b2fb9c406
font_01_sfnt_off00010f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F08 10512 bytes
SHA-256: e5a7d90181e61bc3a486f65d050807a2d039369aefdffb7575238d5243461768
font_02_sfnt_off0001270a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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