Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b71f65d1401d00…

MALICIOUS

PDF

93.0 KB Created: 2021-07-15 10:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ac96bae82b42f23c9229d29796785ac SHA-1: c28c0fd2c5a169b6763d2f06bfb1b7d8f5d7d2d1 SHA-256: 09b71f65d1401d0057b3fd3b3ed6fe2ab776a4f86e5f83c5d008581193661398
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://laros.cz/UserFiles/file/domoveg.pdf
    • http://curry-box-deluxe.de/userfiles/file/2065528089.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d1eaafca6b66ca4da65fe3ede6130171/rogox.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adad82b0140---38977704442.pdf
    • http://abwlanham.com/uploads/files/78752427813.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/101a0159fec32b1866cc037c77c847b8/65606418571.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/24beb8902adcd1af94dc1662f978c422/kelotunexez.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b077819ba1---budagufuwibagedukixu.pdf
    • https://eurocomm-italia.com/file/kazuvexuvakalazoxom.pdf
    • https://leavingcare3plus.ch/userfiles/files/21517218431.pdf
    • https://mt-creativestudio.com/ckfinder/userfiles/files/malipegimevurij.pdf
    • http://imaginove.eu/data/Files/37915896958.pdf
    • http://mediaworld.pro/ckfinder/userfiles/files/43557433107.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/efe45686d7e33e55874fa3b25699ec9d/7588509103.pdf
    • http://duoctruongxuan.vn/userfiles/image/file/woveboruvaxo.pdf
    • https://arvikabc.com/images/uploadedimages/file/lasamadop.pdf
    • https://marljivo.hr/userfiles/file/bored.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/18a8f7f7fa0798dabb7b431941deb23a/wutegikudobupumaronuwevaw.pdf
    • http://aircond.md/upload_fck/file/sirepisupovotuxipur.pdf
    • https://creteservices.com/FCKeditor/userimages/file/geketujugebegozorafa.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b622f183bb5---21967649306.pdf
    • https://kurek-rowery.pl/user_pict/file/zuximapikatomujenunig.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=there+is+no+significant+relationship+between
    • 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_off000108a0.bin
c02252e443b2cb54ad04deea355d0c9c137cd44060c8f24a6e529355603e3227
pdf-font-stream PDF embedded font (sfnt) at offset 0x108A0 10948 bytes
font_01_sfnt_off000121d4.bin
083ef4683324afc3613fd8797c4cb5190e480844bcaa72661ac7c89353d1cec5
pdf-font-stream PDF embedded font (sfnt) at offset 0x121D4 17256 bytes
font_02_sfnt_off00014e53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E53 16792 bytes