Malicious PDF — malware analysis report

Static analysis result for SHA-256 0192823fac110b4c…

MALICIOUS

PDF

95.0 KB Created: 2021-09-01 09:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 050d8d44359ad46fdfdf77af2a412248 SHA-1: bb7d00fe91960cd327065dcca7606c0a79700b33 SHA-256: 0192823fac110b4c0a3ae3e41d18785f8d2edc1d4c2933b673b89a7404632807
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Analysis reveals it functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious or phishing content through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://isleo.com/i_photos/file/3417092248.pdf In PDF document text
    • http://nandishoverseas.com/UserFiles/File/39908963268.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/4e2a11675edaf7d83de73ce906a93ddf/fowijibubomotijo.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb39472500f---25940152436.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/kixanalika.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bb898a3cc---rinikivanuladulegazuxegaf.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vuwalexijotap.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcbdb2a0b0c---1173404908.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/0aa615d54d1cf28b9623614e8e963562/13173604494.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210628193437.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/38790522733.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/difakipegakelapi.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/28961949243.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/komobati.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/32080006735.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/cce6788dcdb48855615e5b79b9c36d2a/wasaruviputaxosumifap.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/34903336626.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b43cea85af---rawoboxokusogoguwogi.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ee531c916e1---12075862283.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5251dbd77a---gaxidelikixow.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///45347727369.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/df1fd917a95241ad39923cc3fe6593a9/68343504885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=most+valuable+brands+2019PDF 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_off00010b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 18800 bytes
SHA-256: e397ed40458b5f18e4905ec0f50b831faf858c87487a029100ca7a78bb951219
font_01_sfnt_off00013c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001545b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1545B 10908 bytes
SHA-256: 6410e84c999b566d6917f4168fde1e5056f36d9b56329a9766c07dcc7bc11d07

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