Malicious PDF — malware analysis report

Static analysis result for SHA-256 d153055c6c5a0ab9…

MALICIOUS

PDF

98.9 KB Created: 2021-09-06 04:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 18c4191dcdb9266af6fff8723a82c2a5 SHA-1: 35bac6a3d6fa7f819ee99aad65c5b59ebe3c8a9c SHA-256: d153055c6c5a0ab91f3f461ea5bb71c9ae2db44e5dfc21dd8eedd42b0b8793f7
164 Risk Score

Malware Insights

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

The sample 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 uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a visual download button further supports a lure-based attack pattern.

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://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/96t98vr37iemn29n00m0ouckb2/doremikitivome.pdf In PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/luxamikokaruwemadox.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/85320745248.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2918f1e49e---rejorafirufufewujijamobo.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/bubuzeki.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/715338h4ravkh1apph6p3b9mh6/dituremivugukesezepevut.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/panitelojebusadeg.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/7333b0forjlp0pr5i8jd0s50s5/nobojuzamerinulugoz.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4ea2823fbc4a1ec7690c4ca35b1b3f04/76859647998.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/32120152334.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/wetapasasakijovizuzawelib.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/bad9ec0d4cabc31a6f7ce210e9c59faa/85115495292.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301f7dd399e---topovalapofisop.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611d828597bdd---fisosamaguv.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16096048a52654---54268921699.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607640aa16377---62547347208.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/bilerozuzavivupow.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/9e70dcfd6a432cbd2c24c065f0ccc630/monexanufiteda.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/41235546140.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/61599373958.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/64205904348.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/22790557190.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfa698d8b5---dapovivelaxoja.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/74882719183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sharepoint+2013+administrator+guide+pdfPDF 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_off00011766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F78 19860 bytes
SHA-256: 526af013510d5df7cdf74342878ec0668c6ceaea210ef8744ffe7c80ed108d17
font_02_sfnt_off000162c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162C4 11540 bytes
SHA-256: a6bd2212178a21e5204e9c94afef9ca8ba08aab5863fbe449ca639d3280f8890