Malicious PDF — malware analysis report

Static analysis result for SHA-256 c166fdcc2e9c12ad…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 12:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b810c9aee04ae7872d30f2290811c50 SHA-1: 92349ebe5de4fc0be47c709f1b9bfe8caa01815e SHA-256: c166fdcc2e9c12ad205c5d3f8c74adf0915a8eccdec34c8567fd21a9eaedaa8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and is identified as a link farm, suggesting its primary purpose is to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attack pattern involving user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=bus+simulator+coach+mod+apk PDF link annotation
    • http://abwingsmd.com/uploads/files/xisiviburifanuxo.pdfIn PDF document text
    • http://briztravel.com/upload/files/kukiluzetigunesa.pdfIn PDF document text
    • http://cellfruits.com/ckfinder/userfiles/files/54212280445.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8dd26032e---bovavogureraxezaxoluwepuw.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/80241939684.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a68489330af7636286c13c975fbe148/93796082506.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/fesamajedosap.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/jipomemobuxunetopiwanu.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/1500328127.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/53ea661c773a1c2c3354313c5f2b1b6f/47766102104.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed6751f0a5---40694276213.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/pinatidulusibapupuminis.pdfIn PDF document text
    • http://kalistechnologies.com/userfiles/file/fukupojugovozidimulezep.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109031525491947.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/48103054864.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/37362004680.pdfIn PDF document text
    • https://fobh.net/userfiles/files/zodet.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/5055512064.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/77330251249.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-23/20210923184446328219.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/2a04a094c7732b0752ad69e6e5131705/32407077133.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210919104235575681v3hp71axb0wa.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_off0000ac80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC492 15728 bytes
SHA-256: 6309694023116d787001311f030fbd1ce6b1124a440fa3b63dcb1dac07fcd28d
font_02_sfnt_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 10788 bytes
SHA-256: 76b812a19b9f55ba763c0d489718e05baf689a2de996c564bc8f5db5aa686a16