Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a098e74a5e351f…

MALICIOUS

PDF

87.9 KB Created: 2021-09-01 05:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b4c4cb27d6d45f6a1a0a033081c2e1fc SHA-1: 9fed010285b11108cc5adf68a30451c23631f298 SHA-256: 33a098e74a5e351fd1e1eadaecc600ee73d9850ddf18b982f7a245423197877a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV both flagged this file as malicious, indicating a phishing or malware distribution attempt. The embedded links suggest the primary attack pattern is to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/a0rc5up4mrvuai9crub07h95q4/kupejixesideromipugeja.pdf In PDF document text
    • http://prestopc.it/upload/file/59338544428.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/cdpcj112e5trl1upomn26mofqk/fazajo.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/29306323689.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/9914621998.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/jitufedekubonokuserinimar.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/64596171581.pdfIn PDF document text
    • http://nfc.soo.jp/file/98794739153.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac228f2297a---59756479584.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/ruwalodetegogo.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/20127184582.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/f00b4797c056ac4a64fac16f1942e53c/larokenujof.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/d09855722f89dfbd92ee2b2d5899dab0/55405922436.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/5on0ibaestr4cjl8hb61gtogub/minafaloje.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/vemabuvogirazuwizemow.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/76175733961.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/40070433349.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/54774439404.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/34780310792.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16092297da4548---895810548.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210811090155.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749318da87c---61534886692.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16083d5050784c---8292765407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=top+atheist+in+the+worldPDF 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
stream_008_off000138fe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x138FE 10540 bytes
SHA-256: 033db6c20f96120bb3295c258529f85369d2dc9e239f442577f7408f22853177
font_00_sfnt_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 21364 bytes
SHA-256: 41e40a6ac7816c2ebaf2234896ed95ed8bcb43eb0f29eb544c2cb9db2cb47c40
font_01_sfnt_off000120e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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