Malicious PDF — malware analysis report

Static analysis result for SHA-256 52514e0f5b4584fd…

MALICIOUS

PDF

91.2 KB Created: 2021-06-29 07:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bf9b9ce21f82a2a0ea69aff5dacdb6fd SHA-1: 75c5b15072c447622431cd49b032f81ccaf3295b SHA-256: 52514e0f5b4584fd56fee1fdd38d56ea0e432223ca66ba5ca33996a1c6910fdf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with critical heuristic firings indicating it's a Pdf.Phishing.Trojan. It contains embedded JavaScript and a link farm pointing to multiple potentially compromised WordPress sites, suggesting an attempt to lure users to download further malicious content or engage in phishing. The presence of embedded JavaScript (T1059.007) and the nature of the links strongly suggest a phishing or malware distribution campaign, likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/3a0aebf3a7bac42a148a73278a183c73/4571377877.pdf In PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca33fa226a---vojedapusojegebude.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/jexojoxuko.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/75171551406.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jinofivuwogegimadukilo.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/71288108841.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d40db49c76b---vilun.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/31506426040.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/8ec4b337824e713a1886bf739722378d/genebofilezisiroluguzibet.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d92367872---rurawigasal.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c67f35b897305392a824de728557ee0c/47193441131.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834f5d23c26---nexamosewunipulutexipoza.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/toninokajola.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/tibonivorinimikud.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081133e29e07---kumoxerexoxakebeve.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/eb0b8ac76de8dd0892a324198a54a685/79237525899.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cd5eeb3ef---zupixodipedonugonajut.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20216251853195604.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7ec04c7a5---jufuritariket.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8411e5711---21332361092.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/94273467605.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/rugetarus.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/74fffee2a3937201a9b70bedf189a515/37479651974.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80836578213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=test+cricket+quiz+with+answersPDF 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_off000101b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C9 17600 bytes
SHA-256: 2bd7a2507fcce7d708674ebca79ed0301c64e2f65e2dcdc7962acc5647d583a1
font_02_sfnt_off00014721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14721 10608 bytes
SHA-256: 0c5b69c6dd57aa72f436c3149d43b1dc097230842089274dda12f0e25434f590

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