Malicious PDF — malware analysis report

Static analysis result for SHA-256 344dee649416610b…

MALICIOUS

PDF

86.4 KB Created: 2021-08-14 23:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b79b9bdf493031ee7955a89548a34cf SHA-1: c535a1d76c696453d9a6a337d82023ab129046a2 SHA-256: 344dee649416610bd05356b9937b4ec03ea9b977f09541cf6853460a0c0f685d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/da0de2f85b1fd7d979a21f229b5ce5f1/pemupewu.pdf In PDF document text
    • http://dtpokebar.com/uploads/files/nujur.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/luwuned.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/aa3cd071df653fe5f8eceed1aca84238/rerusoxamamolodorixit.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/fuletonefikepajozok.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608963eac60fc---dunodewapefesuji.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/5638078613.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/juzagizejola.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/gefuvuvisesukivujukat.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/m4242t2vn8eortccoi57j81o2p/mifujegereravi.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/4f5daa4de97d8fb694781a8382d9c01e/78656064059.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/39284028868.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/rofigebutixesozibu.pdfIn PDF document text
    • https://citronel.com/userfiles/files/tubudujozuwatore.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608da6f27bb15---purimejepudebedazolumuxor.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/sowonisomufavulobipotula.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5612bd04fd---walawolifimevuwukejuv.pdfIn PDF document text
    • http://greenbrier101.com/userimages/niwuwefotukoj.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160741bae62f53---82593587590.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/m7u1qlpdjv56hf9b550jdve0m4/sobikiwe.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/sudawip.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a6fc8fafa---dowazakulupe.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/jonewud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=kali+linux+tutorial+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 17572 bytes
SHA-256: 709d347d7a0452928fd36b5fe53285388a8c0d3ff50d99bc5c1fc6e4022f5e8d
font_01_sfnt_off00010616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 10460 bytes
SHA-256: 203f6594cd2546910f280333f693f2d00cd5f6170751845f993ed251e482c2cd
font_02_sfnt_off00011e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13613 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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