Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb893632f524116…

MALICIOUS

PDF

110.7 KB Created: 2021-09-02 05:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25326076bf09aa9000d2a0a67d184112 SHA-1: 5e17ce0746b480eac8623ef0bcc4a6a4f4845f31 SHA-256: bbb893632f5241167f3e2b96edbb2a00064860c48e0fedd34700c32c21e65ef0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm used to redirect users. The PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://astmasme.com/userData/board/file/kurupekaxenosapuravaw.pdf In PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25302752996.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/1dd20246f60aab378d79954ccd15bef5/2888845577.pdfIn PDF document text
    • https://cecprint.com/images/file/31778237493.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074247a7323e---perorovumekowazejiber.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/bunewidasetisokalovazu.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088c4fe512f6---motup.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/efb6a19e346062a71620eba698d99e90/wawosoxezigosaxuvoxoguva.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f31705bee11---mefedusutefo.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/5hjqcmopioaqjrsv57q4ndkkqk/sidijipowujadav.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/65188458818.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/h5kufem4qfebuduadl2g29sc1c/gerafexerowokixumebipefal.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/vovaxa.pdfIn PDF document text
    • http://bjjiffy.com/upload/25483026139.pdfIn PDF document text
    • http://haphadoor.com/upload/files/mibagugabefuguvutanatanof.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/56jprdprchj1eg25mbnrts9gmm/57887758611.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/62hpccutnboqn7mq9neap4bpd4/fagaxudanodetiferapa.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/9a63f7b047b3dde582f84df355920a86/32680743474.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/93962386238.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/4bcabf2ea76ca3deb3eff1857a21de1c/kiguvofor.pdfIn PDF document text
    • http://ruihuitax.com/files/file/67679907495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+place+a+pdf+in+indesign+multiple+pagesPDF 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_off00014dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC8 17560 bytes
SHA-256: 1d1668c03144966b8459c6773ce950c17f9dd379aa36dad3afde332b4d6cf7d5
font_01_sfnt_off00017b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19393 11040 bytes
SHA-256: 5195953a0d80c984ffb97a44fb3c6cf30a4597267a6eabcb0d4db67e7731c183

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