Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a39010975fc2bd…

MALICIOUS

PDF

84.9 KB Created: 2021-09-20 22:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad907f867dff3de0639bb2eae41a07fc SHA-1: fa7a175b6df8feeba7783b5db5236b1950f754de SHA-256: 27a39010975fc2bd3efd5cddc79cc7ffc131d1a6435761959f7b65128404e8bc
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, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to lure victims into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://huntic.ru/uplcv?utm_term=korean+romantic+movies+online
    • http://jevades.com/aircraft/fckimages/file/9589170398.pdf
    • http://jingyitech.com/uploadfile/46977352551.pdf
    • http://medwin.kr/userData/board/file/firarenuronojixijotem.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/29866dbec3870273fec1144f9c73f4ce/50711260998.pdf
    • https://bacsionline.net/userfiles/file/73244030943.pdf
    • http://travel-door.com/userfiles/file/60850229910.pdf
    • https://hurghadalife.net/userfiles/files/43689092478.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/sjmjehnflsqhef1a0vlpac38fe/zenazubawa.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/xotexaziw.pdf
    • http://www.sanjuktabanerjee.com/fckimages/file/wigemujemirejolukaf.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ede56793c---59257733325.pdf
    • http://gianenricofabro.com/userfiles/files/kiwenirujuzedibitanowawur.pdf
    • http://ltpbetel.ro/userfiles/file/60625508628.pdf
    • http://studiospazioambiente.it/userfiles/files/tegigubaguvo.pdf
    • http://nebovsem.ru/app/webroot/files/files/batapi.pdf
    • http://dieukhactransam.com/uploads/files/4921105333.pdf
    • https://weishinclinic.com/uploads/files/202109111618445706.pdf
    • http://deforma.it/userfiles/files/59435793904.pdf
    • http://fotofolliasanlazzaro.it/userfiles/files/29208328420.pdf
    • https://www.aukuras.org/ckfinder/userfiles/files/gesomaxegemiposapazube.pdf
    • http://arniestribu.com/campannas/file/89126529417.pdf
    • http://tranindo.com/Uploads/userfiles/files/39240023139.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea82.bin
55fe4d708e56aafeb54e656cf29065b936f3472fc0e901cb189f049cfc551528		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA82 17040 bytes
font_01_sfnt_off000116ce.bin
a8a80697af297e3390e0522a70e64bead79f8358ce8c576fad19bb30d851127d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116CE 10448 bytes
font_02_sfnt_off00012e81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E81 16792 bytes

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