Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea3ce72823a2a09…

MALICIOUS

PDF

87.0 KB Created: 2021-07-13 23:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0f8f7b8b239c7dbc976729a6bae940ef SHA-1: 63e86a7aeee7be68566ad5c33a2cbaa0824c34d3 SHA-256: 8ea3ce72823a2a09132b7ea582bc99bebf709963c5d7763e21d5af319b5401ad
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 reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. The embedded URLs, such as 'https://inwebjor.ru/uplcv?utm_term=how+to+take+good+photos+with+iphone+8', likely serve as lures for phishing or to distribute further malware. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://inwebjor.ru/uplcv?utm_term=how+to+take+good+photos+with+iphone+8 PDF link annotation
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/daa6dd8b25b2c0907b3999a85dcba2c2/begaletolezelosazedaliv.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160940f4b9526b---memipiluje.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/722e3f393b8482911826b643e249bb86/28798188854.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/raetilgqrmm1i3lu4pba0ovcv0/raxinumixapus.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3b8d81b39451c5b2b06f0fe611fbb2b9/lavesumefurexijoze.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/coc5kvf6na3ftcc2al85ng5jn4/71904678594.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ce7mekh96cvs7m1c254h5qp7k3/ragazufudibupalad.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160811234c8d82---22352309070.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/60331343897.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/lipejirave.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/36b7091cbae47444059fbc6ce1c08011/tolosaxajofijuti.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/pmjjf1gkqe598om1i9p029osj0/pofofamunalolafitisuzasig.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/wetidudab.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070488d74629---59363904214.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/gejaririrenujizitabage.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/soxidejiwavuxadotigiva.pdfIn PDF document text
    • https://fotovipvercelli.it/file/fekikaporumu.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/66449837327.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c915fef33a9---1402913356.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/abe0233a68852b139367e44a04d43b47/52161283924.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/43361079754.pdfIn PDF document text
    • https://activepymes.com/pub/file/fotofikutisalowixixadude.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/52e917ae7630925c0fbc535218ad0b83/81104628268.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/47691126169.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cbd47185b7bd19e7eb72d6c4e2c09e87/faviwe.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/rikil.pdfIn PDF document text
    • 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_off0000ef7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 16828 bytes
SHA-256: a310c89383d51547fc327b3b98ed183e33a7b2b6578f981a656186aba31147bc
font_01_sfnt_off00011b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B71 10900 bytes
SHA-256: ecaea4efbb6781aa3f84572c8c91fd7991e4bde02ab701489daf888076937c66
font_02_sfnt_off00013479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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