Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d3cbea038fb0d97…

MALICIOUS

PDF

58.1 KB Created: 2021-08-02 21:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c86241710aceb728e95a8b8da3234718 SHA-1: a0dda17a5fa17c3d6b0e172bdb66a6af34f94c9f SHA-256: 0d3cbea038fb0d976a7d734792a23c85439c4ec7b4c6fd98059eb696c3929a11
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious or phishing content through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 5

  • 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
  • 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://w-mill.jp/images/file/topawodivu.pdf In PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/mubebalujor.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ngl4qjtotd76nc7kphfd70vu5j/58194850148.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/j5mjp4087mskkad8v51ova5nlk/zebisuvukirezejozitisotal.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/botuted.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/6101701910.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/59282844964.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa6ed496c5---zasiri.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/zozipemiletapo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdecf9a062---89281133203.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/keribilimamim.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/53f0820972f641f09f33a9738a37e8a5/ruderojozadofozanurub.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/19027199411.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/50609231677.pdfIn PDF document text
    • http://talleresjpg.es/img/file/rakaletogerogakofudub.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad82a5c680e---deramex.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/43723635563.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/43434006042.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a1c6a5088---bupiden.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210606174744.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d049d4316---27266303469.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/36569017149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+use+ingenuity+portable+swingPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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