Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4c6ea60bdcbcd1…

MALICIOUS

PDF

86.6 KB Created: 2021-06-27 07:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 15dd34e32242d875f6204e2a68d6a333 SHA-1: b8b8eda95189434998ea305ca5af6686f5c8aef4 SHA-256: 0c4c6ea60bdcbcd1835deb2aaaf29f77c524ebcace008640fb1ebc65fd7d39b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure itself are indicative of an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/fopeegc0hm3mhbsfsh1bivq0jl/vekonasafiveki.pdf In PDF document text
    • http://smartcevent.com/clients/871459/File/11716073416.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cec5e6782---bunuxiduxazegevutamex.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/xukaguzeze.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0462e70d2b741aa2057e65f439d3b402/xununupukopom.pdfIn PDF document text
    • http://446888.top/userfiles/file/53097061985.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/5e772d774b8bd1854ed161e1aae54675/63705054713.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608139366fbf3---74928223075.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/2144558e341acb73a77f08d1ba33264b/82195679811.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/32843263532.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/dgf5rp4iqp9pnmtf1kq1thb7h7/65869176864.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/tujiwubiboxizozajofetu.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/102784a41ff1e5db46449a40e56bd52f/kuxajafovebawaxatorej.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/vawifosawedifugasi.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/207c00f0d8b72ce8116ca802f39dd815/82600027311.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/vesilig.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/4sqe22fo8306v0cn8p5jvkh8nn/gevofegobune.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/22747292916.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096ebd981883---64305974756.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/jes10qb60r311dud18qj4d9k94/38326710959.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081972ebd207---54249337124.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/17977909033.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d875692222---19440573466.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb7c50d120---daximesagivag.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ad7juralpo4t9pcshnn45ii5b3/jumogudujelepafajela.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/10640227872.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/a432fb0a7d85af6f9a701513d73c7374/26769757228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=factors+completely+different+types+of+polynomialsPDF 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_off0000ee82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10694 17156 bytes
SHA-256: 850651c7f6242eeec98b7eee29b94506c9c64fc1df8607a7b4ed6c166a2cff9f
font_02_sfnt_off00013376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13376 10872 bytes
SHA-256: 39678da2ec25b3a01668494d1582aeed3a632fba3d12e79947bd3afe0952e057

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