Malicious PDF — malware analysis report

Static analysis result for SHA-256 a552246f36290825…

MALICIOUS

PDF

86.5 KB Created: 2021-09-16 19:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 66a8de332e7a9dad7dd4c7f6c4ff9e7a SHA-1: c31c7189929d81571d0d3871efcd366af215d975 SHA-256: a552246f362908252318e57d92920990742d45b85579e95186598f6b15b549ba
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a focus on redirecting users through potentially compromised or untrustworthy sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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://azizavacanze.com/userfiles/files/besuguweseju.pdf In PDF document text
    • https://skvely-kup.cz/files/file/bifinezukepukizur.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614349a89682d---vusokuwetuvozomobozigov.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6607f406a1df9730ae127f0d17917b95/90289765754.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/pepelavagotozuxuburixuder.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/73956178223.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/rogafididukedolowururiwaw.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/savulevil.pdfIn PDF document text
    • http://kant21.com/userData/board/file/molorofenekuwuwusizo.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/megefafotawuzo.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/nofiwetup.pdfIn PDF document text
    • https://tele-video.ru/upload/files/lomekeg.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/52352608600.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/zuburew.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/mafuzizaxenafodu.pdfIn PDF document text
    • http://gestioniarmatoriali.it/3156053105.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/rufupinosig.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/bafela.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136ae6188bd7---tibutirurazanij.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/molizu.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424567a600c---98298238364.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/viselawukamatiwaben.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/kuzeti.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/86264593813.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/situworonoxosajugesa.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ec1fcceb3---28601302871.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/83266439095.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/44200316220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=chronos+app+androidPDF 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_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 18056 bytes
SHA-256: 3647fae492291b85b2776ceac2d175fb43e7bdf6719688db743946e99dd6125f
font_01_sfnt_off00011d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13561 10244 bytes
SHA-256: d1f6e7368da057a256134e843bcefe31a9cfdef0d4260b6fa1a11b1ae095a458

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