Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec83048ae77316b1…

MALICIOUS

PDF

82.7 KB Created: 2021-09-23 23:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f0d9ccac2c2d770dfc3003a8a469dfa SHA-1: 17c9972b03c0d55c127dd5e1208cc3d29d52d951 SHA-256: ec83048ae77316b156979477a2f281a735a9cd6cdab32a4ec7ef39937f13ffd6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, a common technique for executing malicious code within PDFs. Furthermore, it features a link farm pointing to multiple external URLs, some of which are hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded JavaScript and the redirection URLs strongly suggest an attack pattern aimed at user compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://accesoriosalmayor.com/images/userfiles/file/mowabopovop.pdf In PDF document text
    • http://technoauto.jp/js/upload/files/kedovopirir.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/86904215375.pdfIn PDF document text
    • http://glendale.kopanramen.com/uploads/files/13167538741.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/81603761025.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/zaboto.pdfIn PDF document text
    • https://partnermind.cz/images/files/tofubitofokudigifuxudewu.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2f709a12c---palajalijokaxomep.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/denumakujizivevakukerubo.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/befuzokojefawazos.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613282da2739a---ponejatojasasusadoven.pdfIn PDF document text
    • https://emenu.hu/editor_up/zorifuwajefek.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/pivagivuw.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210921021728688.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/rs14smq8vticoj1o6h77iopks7/46807809014.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/91338107987.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/47704403134.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/14c2f0a0d20df8734a053617af2ec62e/kenusajenoxaduvuj.pdfIn PDF document text
    • http://full814.com/upload/files/sopik.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/ruver.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/73721356750.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/navefawuwagagofixozifo.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/16465547941.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/040c86fe195a5b47466c1f408cc9e40b/zobejawutorelozitorebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+connect+webcam+to+android+tabletPDF 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_off0000df8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 10580 bytes
SHA-256: 5163ec9f13fd24ea6e8ee0b3e1cb288a61ac7b7a5d81812c0fe5fd045052894f
font_02_sfnt_off00010fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 17652 bytes
SHA-256: a5997e1e8cdb81038ad75dddd963c07b83d918758f7ad003fa366d3d33af9b32

Open this report in the interactive analyzer, or submit your own file for analysis.