Malicious PDF — malware analysis report

Static analysis result for SHA-256 11914329ae8eef5f…

MALICIOUS

PDF

78.3 KB Created: 2021-09-13 21:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3ea4eed2757dccdcdd8f39af107659c SHA-1: 5f1975b324a899b6da27d974fec1aaf3de67a97c SHA-256: 11914329ae8eef5ff75f7b96ce31effb36cb5f0e4485f119e0607226b2116fd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains, which is a common tactic for phishing or malware distribution. The presence of PDF-specific heuristics related to URI and link farms strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=old+smartphone+as+webcam PDF link annotation
    • http://adirondackseafood.com/ckfinder/userfiles/files/buturigolivutuxelijin.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf2f0a864---34343159605.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/lojiruzumazoxokel.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/51826491735.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/romisigepewujiligin.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/movatikuxapafivow.pdfIn PDF document text
    • http://electric-kernbichler.at/fukukidom.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/nizawaveguw.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/xetor.pdfIn PDF document text
    • http://villkasz.hu/editor_up/xovimatubesim.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5716a40c5---puwidajejapitonoto.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/lifexip.pdfIn PDF document text
    • http://timebymtm.com/upload/files/sodaradabagedisitewege.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/855676269.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1612fac4d6dc9a---xomatusapegetosunefir.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/85552485545.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/mivaxeritaven.pdfIn PDF document text
    • https://eurotig.ro/file/tijixejuwezita.pdfIn PDF document text
    • http://christopherdallo.com/file/kemivafibibep.pdfIn PDF document text
    • https://nada70.org/userfiles/file/66610497146.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_off0000cdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C6 10940 bytes
SHA-256: 15a3331ce94a577c1a82afb9f36cc5859dc23e30aaf0ab7a0407276bdce1f408
font_02_sfnt_off0000fec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC1 17248 bytes
SHA-256: 28e4ce5aaf1c3db55f3b09b46941c297eca88bcc5dd65ac32f8679b4591bf77a