Malicious PDF — malware analysis report

Static analysis result for SHA-256 4977b6178b7de8f4…

MALICIOUS

PDF

86.8 KB Created: 2021-09-12 01:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33be6d72e1651fcf688846d4a76da580 SHA-1: 65e9a105934458c7c6b934ca56c286417dc48260 SHA-256: 4977b6178b7de8f4146ced810c3a8cf5768ba0f15efc87fb959231fd9827c4c9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://too.kg/wp-content/plugins/super-forms/uploads/php/files/0d102584822ac3062c4a7349012c0098/xuruzasumuzepajowenimaxaf.pdf In PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613363be7b383---83531946269.pdfIn PDF document text
    • http://happy-land.hu/editor_up/22603244144.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109071033403624.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/e179qmhn045rps2a1il7p8da20/91828745486.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/stfqrif7op91og2te4cv98vlo4/1175036294.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/82719428762.pdfIn PDF document text
    • https://fishboat.hr/files/sanixedaja.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/riwexarisutepevewaluxol.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/fulakusurom.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/87078124571.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/gijur.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/31099170578.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a6f171fd6f0af652f8e82a3af6c5ff8a/jabomefatibuzipavib.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/49931453332.pdfIn PDF document text
    • http://palami.by/images/file/fetatisifosurobevuwataf.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/ziviko.pdfIn PDF document text
    • http://salwex.hu/file/zobatevulomijesup.pdfIn PDF document text
    • http://schturman.ru/files/files/89177481333.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109111101155478.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/71650172253.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/82726883108.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/65473716397.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/gudotatugasikofarawaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pixel+car+racer+hacked+accountPDF 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_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 10592 bytes
SHA-256: 61c1744da6a5b6e7d4a855ac9e29b964488bb6b1e7ddeffb136f140b619fd338
font_01_sfnt_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 18152 bytes
SHA-256: 0affea541afe817dee13b14ccc0304a9dbaf60c907c81d0e3bf7ac1dce136b46
font_02_sfnt_off00013565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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