Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71e741135e398b6…

MALICIOUS

PDF

156.1 KB Created: 2021-07-31 08:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ea85d02f455b0fc9bd02ef923a80f787 SHA-1: 0c9684df07c57110d20443c36a97872dd31efa95 SHA-256: b71e741135e398b694944ac16e885f63fa3f3c44c99e9f15bf4d3ac9fe6624b2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the presence of numerous external links indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9119

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://condominiovillage.com/userfiles/file/68403692337.pdf In PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b42d3890f5a---74853202218.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/61688056026.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5cffcfd65---foloxeneluwijeworanu.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/kirivuvotov.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/mutalo.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/86860177034.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160766f8b417ab---fibogugakivudeloxizugel.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/84807856192.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/57954223715.pdfIn PDF document text
    • http://robedecreateur.com/img/files/11514306281.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/85214786310.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/kozuvotodiwufoguvobiposus.pdfIn PDF document text
    • https://saam.vn/images/content/file/jovanubatojoxapi.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/29845358487.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/totitijatet.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64996294466.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/374b2e82b6e624fc43d04c46ed630096/tunifi.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/zekagofizotefugesipawad.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/wexoxojefajuvokote.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/serilube.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/a563fb04333dec9a6c579758545e963b/zugen.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/1483762463.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760aac451e8---40542087695.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/52532626602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=anatomia+y+fisiologia+del+sistema+inmunologico+pdfPDF link annotation
    • 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_off000206f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x206F7 22220 bytes
SHA-256: d9b5feeb4185cee20e90e586eee160880a3a1dd7cf039b7688854267f90231e4
font_01_sfnt_off00023f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23F0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00025726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25726 11056 bytes
SHA-256: 606539d6f918e144e57d8c2d7f55ef10b093bcddec5c8baf69e50afc40cf9872