Malicious PDF — malware analysis report

Static analysis result for SHA-256 4690ab59657212fe…

MALICIOUS

PDF

71.7 KB Created: 2021-09-02 06:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4844b82cc092dfc9ce79667a94840b8 SHA-1: 9b7edee3b70814a4f13b32cf6d8971f55a049f5c SHA-256: 4690ab59657212fee52b5eed2a3650f39113f5d6cba81ea52ef5914a85c04e37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are indicative of a spearphishing attachment, likely leading users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://garglob.ru/uplcv?utm_term=clearing+her+throat
    • http://neodentpetrosino.it/userfiles/files/1465198391.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e6cd7de67a---85513641032.pdf
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/33163719096.pdf
    • http://harlit.com/ckfinder/userfiles/files/20210804_042409.pdf
    • http://uceng.net/_UploadFile/Images/file/12227060884.pdf
    • http://headlinesdinerla.com/uploads/files/59817650893.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160af85cc24b0a---56282260329.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea99d2b8f8---35562214822.pdf
    • http://moiarchitekci.pl/pliki/file/91226338240.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79e181152a---46605279158.pdf
    • http://stellarp.com/userfiles/file/19046700021.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/d6e2e784ca797141ec71faeaa85c1413/rabuvurifuv.pdf
    • http://moiarchitekci.pl/pliki/file/47356136885.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/500uqcust6fjdqnlalu0h8p85i/44410387951.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f924ae0f5---86471209786.pdf
    • https://haysalon.com/public_html/userfiles/file/6839412194.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160900097229d8---83586223674.pdf
    • http://polesprogettazioni.com/userfiles/files/52743693129.pdf
    • http://hoilhpnqbthanh.com/upload/file/gijinulapuxopewewuta.pdf
    • https://foundryindia.org/userfiles/file/bubizapu.pdf
    • http://stpatricksreunion.com/clients/84553/File/lojipizaxap.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0fea6e476dfb49bd38c6a707ad009825/nuvitipanulovukugew.pdf
    • http://iaestedresden.de/userfiles/file/jixewotezokep.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_off0000b9b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B6 16792 bytes
font_01_sfnt_off0000d1cd.bin
b3b8a78f33052e68f4b2e2eabf3bc99448030da2be8c7e09f726005a1cc53e70
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CD 10248 bytes
font_02_sfnt_off0000e8bf.bin
0b674ff308e7ffbae6213ef3a948fb731b3dffedf6978ee53ee90bcca23ec178
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BF 16156 bytes