Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf972a6121909373…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 15:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c61060321c18f797018358c2c28259ad SHA-1: 13dce0d79b7e09da52d2f333bb5bcb63e5fa3404 SHA-256: cf972a6121909373b60e9fdefed0d9b782cc61f00b0b463b251a32623cafc952
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of numerous URLs and the nature of the heuristics strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://camonetinternational.com/files/file/givoniwilimikafurukomore.pdf In PDF document text
    • http://auburn-properties.com/userfiles/files/lesigise.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612518f426ca8---sanemifebawobugixegomaf.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/35297059634.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608236a568ee3---jileragev.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/29511798147.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/h0fhg2gl25cq6geksf66oe8i7m/23232146210.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/84368628684.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/56932600722.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/vh7ai91q699g1a6tpu8rljq1m6/napikituborenativ.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/11183543294.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a346911e279---96503058790.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/jokesap.pdfIn PDF document text
    • https://samowar.ch/upload/file/46934792763.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/42821041498.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/57097975869.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/20401514144.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/zagalufagejikipag.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/32155657091.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607164076acef---neropamovexapilisukesalef.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/97637139738.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1le0cler0cscdpst38ddvl9gf0/xedeguvozusulufevumedag.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/sekuwumokomuzajum.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce25f5463c---35648795431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=root+words+and+affixes+worksheetsPDF 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_off0000d763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 10728 bytes
SHA-256: 07fd65076c66cc1ef39b2f36b97ce7a082601dc45cafa9ef05a71ab426097ffb
font_02_sfnt_off0001082d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082D 17860 bytes
SHA-256: cf2f467f4152f5341a24f6adf1acf61d703fcfc6faa193623b6c23001e75936d