Malicious PDF — malware analysis report

Static analysis result for SHA-256 925c74b6ac49d19e…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 12:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8558cd7045fd20943beb99907b82397b SHA-1: 12d399cdd5f714bc534c810db0b38330e39aa10d SHA-256: 925c74b6ac49d19efb43ca71a36923f72caf36ef3008454b45fcc2c506b687b6
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS uploads, a common tactic for distributing phishing lures or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest the primary goal is to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0aee532ef52b7f55319d3ab786b53552/bilulagilefasamebeja.pdf In PDF document text
    • https://gyn-koe70.de/obrazky/file/zoborobofev.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/mamizufizasofuwuguzoter.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/ruputuwa.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/nasugekagedaragufegar.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4a333719f6bc6dd07a51cadf12700cd7/kawuzagi.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/34616611895.pdfIn PDF document text
    • http://erdbau-rauch.at/71288917129.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/mazigexulunamozajolipuj.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/tepajulere.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/13ee3e708cb17a23a0dd41ff7d09776a/zemokatagowuf.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/fedumu.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/riwowega.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///55788164340.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/4d4b3e8f8dc5a0ade9780cc9b22f7433/33388889055.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4880669b9---68212904402.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341ed3cdaf4---lipikiki.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161436345ec3f2---tirafonitodepi.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/mapotafuwosumasufat.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/90061150667.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210907073001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=roblox+id+codesPDF link annotation
    • 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_off0000ddf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF4 10188 bytes
SHA-256: a64e8e3b03908a49adc93e0420692bbd45791d8641ca35b5883ecac8f61d80e6
font_01_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 20760 bytes
SHA-256: 16b59f18ccbddddbae7bcb76bb6d048eb67d1b8c29468cfd4e74631d71338b94
font_02_sfnt_off00012b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1