Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d66778659eaf0e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-09 00:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 165152fb85f833f869fbff4f95ca23c1 SHA-1: 128f18f824e4d509be7ce66309ff174bca6dbe27 SHA-256: b1d66778659eaf0eba5ff5ba07bdb0bd31cff3b8b54700529aa841eb0bba6399
184 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of a 'download button' lure further supports this, although no specific scripts were extracted to detail the exact payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pho32shabu.com/uploads/files/21864027087.pdf In PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/32025846799.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/65238137091.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/48873542717.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/89112328266.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/61941879308.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/konixiropidasufalitibuv.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/vusejupiduzemuzo.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e0b02255b592e3e5cdab406b24f12232/77920768784.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/14432889984.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/24717412553.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/durugiduremilaka.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613066ebb494f---74274523351.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/lavokifa.pdfIn PDF document text
    • http://dentherapia.hu/files/file/lapevimumebesazarapigobo.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/zakudurididaku.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/35961211540.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/67161139200.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/judugofezovufe.pdfIn PDF document text
    • https://ptogel2.com/contents/files/35556107264.pdfIn PDF document text
    • https://tempegaring.com/contents/files/zazozedij.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/d0e89fu6i3arq5ub9sl5h6gr0o/lujetikufebaxarapuzo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132407c3f866---xafagowigabejiluzunef.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/mhr9muniitp8h3njns3kc2hue7/36635274443.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/89577502599.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/fovejupumumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fastest+way+to+transfer+files+from+android+to+laptopPDF 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_off0000da3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 18112 bytes
SHA-256: 9238b053818e81b658175d2f3d5ae9a6b2c2b862464c28d63e6cf644d20cd6a8
font_02_sfnt_off000120cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CC 10836 bytes
SHA-256: 6c64ff7773bddb2ca2395294b50f0accc943d5d34ac1604dcb9b6b9c26186b29

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