Malicious PDF — malware analysis report

Static analysis result for SHA-256 f180ca930b3932ff…

MALICIOUS

PDF

83.7 KB Created: 2021-08-28 13:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 75c2958f34baff80b8c95dcfa36ea54b SHA-1: c90e9f4646d207ae338db29063422282d3dbd7a4 SHA-256: f180ca930b3932ff8b2144585490613a4e5d3e0925fd54abd8bbd8328c0687b9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://medvor.ru/uplcv?utm_term=ethical+hacking+books+for+beginners+free+download+pdf PDF link annotation
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b551b222a52b6a313277d049ea819afb/goreripavun.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/59268686413.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/2c5426d1192769379fb5bd0e49923951/giselovavunugiwuwixa.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210804175019.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/matokaliwilivipovegivebig.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/cvuk4ks8b18vlm7q43npsa1uk1/zejaganufafewaf.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/safag.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607d00d4c5ecd---wuxiwuba.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/cb0d734465085a13138879397bcee776/85368230389.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/79758654839.pdfIn PDF document text
    • https://iohrp.org/f_files/files/fujezuni.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a9ce1a70c---wadiririgobol.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/f9f9264d945f9d8b21e7de8fbc701afd/pugulej.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210707_E355F5ADF7D4C7BF.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/weguvoges.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/ce1054dd7faecc6363605174f6ac4376/lupudolofane.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/288v0th3ijkgl38k5f8m68jeb5/81524680057.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/5614846274.pdfIn PDF document text
    • http://peoplefineart.com/assets/202108/files/20210806220514937304.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f5dc6152c0e---44805516109.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16ba0165c---2011729441.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/99773490619.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/jidazapolagosat.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/aecee7ab93fa382f10e8aa4ce881d229/73091701794.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892627ca969---48058215655.pdfIn PDF document text
    • 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_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 18280 bytes
SHA-256: bb5f800c0cc2a32fc1bb5b3e1d6424c0f679dd51ceb663417c6816945948f085
font_01_sfnt_off00010db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB9 11200 bytes
SHA-256: fbcdd809c4600cb2417dc3420e798133243fc39de06e1e7e1b5cf2fb645137dd
font_02_sfnt_off0001278d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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