Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae635a2c84823e4…

MALICIOUS

PDF

77.3 KB Created: 2021-09-09 01:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c483d7ec07f11468b5afd403f83f9e2a SHA-1: 17b9a62c556bc4e396dd3d5941c29ff7463ef1cb SHA-256: 4ae635a2c84823e4c62e12ddf745f9a023d1b4d0d9e11bc9e4924a9680678c8a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://krisoc.ru/uplcv?utm_term=how+do+i+print+text+messages+from+my+android+for+court PDF link annotation
    • http://apisicul.com/userfiles/files/vogumevenibimeme.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/3506111919.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/zukeju.pdfIn PDF document text
    • https://sanidom.pl/img/file/pomap.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136a4eb6198d---68663210441.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139298aee619---zadodebizubakaw.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/57857393438.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/94968409294.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/31474740511.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/56751940354.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/47911293720.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/dde20cbf05a38c1976c0e6a05ac72050/79802324146.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/lufovikijil.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/12604042355.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/8486162105.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/18017298033.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/80890666785.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/botareragaka.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/zagozu.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/32251467660.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/22658956287.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/papijobodefasuzojilil.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/levonubaf.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/050634518128.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_off0000c791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC791 11308 bytes
SHA-256: b7d3edae0fd077db1e1ac1e14630f8fc18fd71c061e5c8b60a9e719a3018d1ca
font_01_sfnt_off0000e204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE204 17648 bytes
SHA-256: 79b62424bfd19b21e86ea6038fafadc70ae9aa7c66711a217894d4977d4ea12b
font_02_sfnt_off00010f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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