Malicious PDF — malware analysis report

Static analysis result for SHA-256 592c92ec2c621940…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 18:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d70710133fdad5a9467f191e86bd12db SHA-1: 236243f0834aa8904ec57d0cc832bf7cb6b543df SHA-256: 592c92ec2c621940b82c3e98c1d587e94ef51ec7bb0d4857df08fe1d0258553e
156 Risk Score

Malware Insights

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

The file is a PDF containing a link farm, with multiple heuristics indicating it points to compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and link farm structure indicate an attempt to lure users to external sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://ufcnagykanizsa.hu/userfiles/file/dexavagozozuwutijozupome.pdf
    • https://galaxytraining.examinationonline.com/files/gikuruk.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7e8c6927548e63e293454757572c9be9/dajepafiguvisofizusezibab.pdf
    • http://honghuibio.com/d/files/bamimuvuzida.pdf
    • http://msdoubrava.cz/foto/images/file/48756598390.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dj8fl6i78emtotg9sasbtjmaj1/minawifakifaditavelagotef.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139bcb00b4ad---1948221202.pdf
    • http://ncteonline.com/userfiles/file/faxesovopawefosebofet.pdf
    • http://esistore.com/userfiles/file/zalatazisozanin.pdf
    • http://miskolciharsona.hu/pictures/file/tapawad.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a2910f5662a6cab1ae56650c40d3ef2b/disevuxonadapareje.pdf
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021971736115403.pdf
    • http://www.stemcellhairclinic.com/files/files/mifamoredotiwexefoxim.pdf
    • https://stealthwindow.tw/uploads/files/202109130612012664.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/59314014829.pdf
    • https://abofahed.com/userfiles/file/nefolodexuxezobidew.pdf
    • https://girl0229960192.com/upload/users/files/numul.pdf
    • http://holland-ex.com/images/blog/file/53540348708.pdf
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/52833645877.pdf
    • http://www.ruben.pl/ckfinder/userfiles/files/44152246288.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613000c8196a1---83209230768.pdf
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/18685272.pdf
    • http://yongchengtech.com/uploads/files/202109011107479537.pdf
    • http://maility.pl/_ADRESuserfiles/file/97815087514.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=horror+game+among+us
    • 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_off0000e20f.bin
34a2f9d585f286f129d4c63146974e22fbfdd251576ae3c43e6dc2c7c5dad454
pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 10308 bytes
font_01_sfnt_off0000f93b.bin
13c84009a86fb457143dd57f32f7d0f1b251bcedf52aa1510662fe09da9aeae7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF93B 17320 bytes
font_02_sfnt_off00012645.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12645 16792 bytes