Malicious PDF — malware analysis report

Static analysis result for SHA-256 57083fd84c9159f5…

MALICIOUS

PDF

89.8 KB Created: 2021-08-07 00:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce8576bfe74ad15e8016189ec3be74de SHA-1: 7080d137ba93d654617a875c528388e113cad6c3 SHA-256: 57083fd84c9159f5616927e026bd9fa4174bff6a1318033cf0a7a8a2be6c2493
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics point towards an attempt to trick users into downloading further malicious content, likely disguised as a free emulator download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/4a6d35db371ea0ddca23602191d8b0b4/tifowisot.pdf In PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/40762255865.pdfIn PDF document text
    • http://fygl.net/uploads/file/210858098444.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/fonibotota.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e22b0b193e11a15d100e63265a1940f/gazuxodevozojuboguj.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/kanipafus.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/08e37e6cc9b8df1ff8d1c377c5b620a6/36055671705.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/rulopenapubikabel.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160964ac611e82---58776192971.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/41188280757.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/17830980569.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/neuj23uqs1deqf2gb6r161u6pf/zukibosafu.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/27830142653.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/mizadipole.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/gukuvabo.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/wixadasexamopunowe.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/aviveropedujokanifux.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/5841664556.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6379f67fbd---tiguronazarupogaxamax.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/72b7e4ad69c829f344a524cf0de94e09/tinajozinunida.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/defunewifos.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/vosodigase.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcfc289173---jewofexubuguvosewo.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/84662575796.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/zokejilelawowexegisoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=free+download+ps+vita+emulator+for+android+apkPDF 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_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 19140 bytes
SHA-256: 0b77671e811be7816b66e32ffe5701e4ac4e4ac69305389bc3d89f69459f9552
font_01_sfnt_off00012748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12748 10980 bytes
SHA-256: 0be51388c00cc38678f03752d4ee14636bbd33221b2758e8879e0944187c85d8
font_02_sfnt_off000140ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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