Malicious PDF — malware analysis report

Static analysis result for SHA-256 f385ea43c97d85d6…

MALICIOUS

PDF

88.7 KB Created: 2021-07-04 07:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9a6f16abe142a01dba4ff32ee529d363 SHA-1: 412c05285b8b501586f7ef6438bebb44021b21c4 SHA-256: f385ea43c97d85d6a3d1da54dc929b84f1dd76d2393a1a0076363c851a38b8f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that contains a link farm pointing to compromised WordPress upload directories, suggesting it is part of a phishing or malware distribution campaign. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ced94c48d28---zavomutifanewatupagaw.pdf In PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/rmtm7ves91go0b2bn2oj0efkh3/77107609115.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/3jmavku4d5ncc9m9pa8jcesspm/90969120026.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/4642878d58fe74f48acb8d461bcc16da/23078253791.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af90180bf04---92458722201.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/88157271658.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/p3g658mode7qorqsbj0jibva5e/45088097196.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/13434961e69ed992df51392e9661e038/fadovofovup.pdfIn PDF document text
    • https://andrejc.si/files/file/44198156523.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05113ca83b---regebuzujibuzujukovabi.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/02080be8857e0294cb93055993fb9fed/64222306888.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092041816e2f---98197245490.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/nhd03spbeg82p1dulo58ndu143/letedeg.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050713364954.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/39288783761.pdfIn PDF document text
    • https://carlojans.com/cms/file/18926351571.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee9e67eea2---23394965652.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160815b580b40b---62898986555.pdfIn PDF document text
    • http://polkovnik.su/upload/file/dijawavuk.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/2549f4580431c517389795f895b987ae/diwofoxilapeje.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/oitjdog9dfke1p4tr4giktpq6d/81872767607.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4881dbd51---76314474373.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210620_155008.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a44875d4d88---4618916048.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160908acad8d96---kabijasokebuworige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=civil+services+prelims+question+paper+with+answersPDF 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_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 17524 bytes
SHA-256: a0bc8f3ebfcf6a8957e0a22f03e04700fe2d8ed3a7adad82b6e5dc31745506db
font_01_sfnt_off00012345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12345 11068 bytes
SHA-256: a16957750fdaec91996416f3f4369b9e126d5d6708ad90ebe3221af475b460f4
font_02_sfnt_off00013cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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