Malicious PDF — malware analysis report

Static analysis result for SHA-256 662c1162e18060d3…

MALICIOUS

PDF

88.5 KB Created: 2021-09-02 17:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b72a46d67148d0b405efe96d46eaf4e3 SHA-1: e20b7ad77d379ce4481d9b2b472da9170cdb978c SHA-256: 662c1162e18060d3b870f1a62677a6257f12d7d677bb78ee86ae7cf56561fb58
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://shen-su.eu/gfx/userfiles/files/tezulamujuseg.pdf In PDF document text
    • http://maymaygiaydachidang.com/upload/files/lunuwujunulanejul.pdfIn PDF document text
    • https://biomisszio.hu/tmp/35852620894.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160812333a66d5---ruginaze.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/puxamo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lmnp6fb2d3bs85pms9bl7rb1o1/zusudemabexigodigisineja.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/razuziwibifupiges.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/dc72c5dac53736c59470ef463a0a2ff3/womutirowifiwokut.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/17110985754.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/76231024131.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/74699408654.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/gonilozulakepuvukikaw.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/budilutenezavabep.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/cac5bc5ddce773757a92b5f04c13ebe5/sopojinanetora.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/11632537014.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/8e5c4ca9423c3cd1449a11367eafd3ae/94541642801.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/xidaxovowimu.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/78678676129.pdfIn PDF document text
    • http://candientuvibra.com/images/file/47814026138.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/88968080468.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/88738541660ff52651f5b3.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/genirogowesotidopomewarej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=definition+of+manual+dexterityPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD465 22236 bytes
SHA-256: 343e9f491f2ee0c144b50efcb7e3c960f38699adbd5230b82c60bea856ed88ac
font_01_sfnt_off00010c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12491 10664 bytes
SHA-256: a230aff7c952a76076602c8e2f32163215f5f34a4bd2a76967d20c3bd8c13e13
font_03_sfnt_off00013cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF6 16428 bytes
SHA-256: a62bea588a0248116cb02c2134abe344a2d627fa84529790880568979c69f13d

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