Malicious PDF — malware analysis report

Static analysis result for SHA-256 335c6cb623e9aa92…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 22:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97787e9a5307720631e1558ab3c8d065 SHA-1: 4af985dd9402541506182ac704a9897b98c8e3da SHA-256: 335c6cb623e9aa92e29f1c0788cf4afc61fb684b5d8fa6adda269af3245a1ec0
164 Risk Score

Malware Insights

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

This PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish credentials. The presence of embedded JavaScript, though not directly executed by the PDF reader, is a common technique for obfuscation or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://straub-online.ch/userfiles/files/sifurubifebi.pdf In PDF document text
    • http://polipack.ru/content/file/29031755983.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb41b50440---43285164088.pdfIn PDF document text
    • http://sushibelovo.ru/files/54242298745.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/17782213394.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/farolukopevekunisejuvik.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/49767358711.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/5aj8a05b65uo03n0r7im1rbcm5/76726598135.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/29035627413.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/ruluva.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/kufidulam.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/morito.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/30088352132.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/iogifl2q58gi7dse3pqsn1o8sq/7009757756.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/budowabit.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/xipimuze.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/3416273382.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/87089314260.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ee6b27bec548d6d8d4422de75ebb4147/wijunolosuxi.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/sikuwedenukonuse.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/depivuzerorisafilip.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/9470531571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=download+video+star+pro+androidPDF 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_off0000d66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66C 10540 bytes
SHA-256: b56f0cf3f567539d407f9f8a87f926a0d1e7e90651731d9e2284f1153290e07b
font_01_sfnt_off0000ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AC 17780 bytes
SHA-256: 2e60770222c95af68951570d34be6a07185ab99160d1f761d5409144798d15bb

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