Malicious PDF — malware analysis report

Static analysis result for SHA-256 230990c61552f6b3…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 23:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 55f6615674ec91d4fa0504898aa5aa7d SHA-1: edb4ea0558a1874d596e6dc21b4f557651ae5b01 SHA-256: 230990c61552f6b3ecf39f5c1dc12915991842ca07bc13277fe2853189ee71a3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to lure users into downloading further malware or visiting phishing sites. The presence of multiple distinct hosts and the use of UTM parameters suggest an effort to game search engine rankings and distribute malicious content broadly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://trevelsi.ru/ckfinder/userfiles/files/83076472650.pdf In PDF document text
    • http://goopenapp.com/uploads/files/fibenunifawesuku.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d27b29de2b56ebcecb1cdb7ee2b0867a/sumuwevuxozifoneto.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161316e7fbb311---dezidugevuzituxaluvanida.pdfIn PDF document text
    • http://islandpointfl.com/userimages/basudeziwolomupudomiko.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161305aab891f1---fimimezodixanazubeva.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/tagisaripod.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141fc966b934---54764865431.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/25864310354.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614067e38e754---xobesijanatobeg.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/vutijoxepozobidijagosaxo.pdfIn PDF document text
    • http://belovosushi.ru/files/90216887760.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6ab0e899f---nunozurofejum.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/finujawizapodojagujazoj.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/dakoxojoparal.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141eb7cb8f55---26447511281.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/97085414726.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/rarasosozore.pdfIn PDF document text
    • https://jck.ro/userfiles/file/71799672053.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/69691168244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=kannum+kannum+kollaiyadithaal+movie+download+tamilgunPDF 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_off0000d277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD277 10876 bytes
SHA-256: fc13504a63a7c49fea85da95e3adcbaa74df909b3c6fd0d142dc8aea687205c4
font_01_sfnt_off0000eb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 18824 bytes
SHA-256: 49dd08d0612653952bacac25b03e645dd05f1ec3edc1220e4e8e58f452a0bd9b
font_02_sfnt_off00011c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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