Malicious PDF — malware analysis report

Static analysis result for SHA-256 883fb39c2c800f01…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 16:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3cf98cc875f8b606a6a28de85bbd56a9 SHA-1: 6e908a21d7cbf92abb837837a81e70483861a78b SHA-256: 883fb39c2c800f019b17d6bc41f4dbe73617c281d3bb96084f444a6b683ec568
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://finara-v.com/file_media/file_image/file/86983950456.pdf In PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/23877025274.pdfIn PDF document text
    • http://3q1p.com/upload/file/210905105316134501gstmn6t97hng.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/kesabefetunok.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/kujuvapuman.pdfIn PDF document text
    • https://jetaime-shop.com/files/25050283420.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/44312613383.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/81379414752.pdfIn PDF document text
    • http://auvergne.annuaire-regional.com/ckfinder/userfiles/files/govew.pdfIn PDF document text
    • http://topas.lt/userfiles/file/51323256291.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16152756cebeab---70391012276.pdfPDF link annotation
    • https://medicentrumnz.eu/medicentrum/files/file/denuwisuwarov.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea97ef72f---bexik.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191214799518.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/zolemigel.pdfIn PDF document text
    • http://jfe.hk/userfiles/vomokinokunopitegiz.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613878a5bd801---79247379450.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/13429109606.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/43416431244.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/19917620711e51b80c6456603c3f0e7e/rosolipiwezifok.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/bezulaxuridul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=critical+ops+latest+apkPDF 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_off0000b075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB075 15256 bytes
SHA-256: 336d09f207716f3a3e840cd9a2bc5f332346c37de2825b961620f2477bbbb29a
font_01_sfnt_off0000d6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EC 10388 bytes
SHA-256: e537715d5468a284fa6c12a07242f9d6bfd99aa1fc72426f7adddd43004f6eb6
font_02_sfnt_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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