Malicious PDF — malware analysis report

Static analysis result for SHA-256 b554a5274e332ac0…

MALICIOUS

PDF

97.4 KB Created: 2021-09-06 20:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d927cda478e75cc77c37fef169862a5 SHA-1: 36a7e8ebda422f4b15791dd288bffa002e250cd4 SHA-256: b554a5274e332ac0a7cb97bd9275d68fc9c4be4955a08f04aa97f4b875071b55
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or suspicious domains, including one hosted on a compromised WordPress upload directory. The PDF's structure and embedded links suggest it is part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ksnjl.com/userfiles/files/topulitogeroluniwakavefo.pdf In PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/23431810760.pdfIn PDF document text
    • https://majubesar.net/contents/files/naluviwifomovigumi.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/89817161206.pdfIn PDF document text
    • http://findplusltd.com/file/77047085172.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/8e592164a5502135f9c4d384d2c948ca/48347898521.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/15022853979.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/wezesazuzezubaselasede.pdfIn PDF document text
    • http://skupka23.ru/upload/m/xuziwerugufunuredakapik.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/zekoruxuvuz.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/wududazikagoburinos.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/50a6bebd3432e9b0353922a3a23c8d22/lojifu.pdfIn PDF document text
    • http://debden.org/userfiles/file/muzisewoxagis.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/60891887263.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/39d89932ef3673921c7f3fc1528feaec/nusaj.pdfIn PDF document text
    • https://fallsplat.se/file/21826464642.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c58e7957fa---jigip.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/pugilipaputajeponomomu.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/5792261927.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/zivofebuwopofixus.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/f63cbd60c4aa692ec387cded82b88d91/penulujavoges.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/dodilekiku.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/70584262974.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/ebe7369ef65ff4d8f96db5d606913fa6/talowefasimagozirivetisof.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/jonevuwerugeligokezuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ready+for+writing+cae+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_off00011301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B18 10824 bytes
SHA-256: fa7627b16a7dedee9e30fb0034d9e6b08d8c2a002266f25f1122bbc6c81227be
font_02_sfnt_off00014404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14404 19780 bytes
SHA-256: 95a404c77731ccb407c9cc040d0fc65dcdd1c1ed99d2308d7ba50d18efab2457

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