Malicious PDF — malware analysis report

Static analysis result for SHA-256 79312ea65e666ef5…

MALICIOUS

PDF

108.8 KB Created: 2021-08-11 23:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: c597843a523804e8d836eb57fa2ea4d3 SHA-1: f5fc8dc5dbd4746c68ffa86f82174b16a884b4fd SHA-256: 79312ea65e666ef5af2eade0193179663233c1fa7562134d21e9d6047c8a20ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dfee46ed8---modebunazu.pdf In PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/77556317877.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/22270340970.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/dugidelaranexabomos.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/c9d6efjkoh4bavv50j6m6j8rdq/gatijegoxogegagabazaju.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/40487468051.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/6ac5250ab83bdaf5e9edf462966b81e8/dagur.pdfIn PDF document text
    • http://kgmda.com/upload/files/29552034382.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/lagumimezedibevinafu.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/91089660080.pdfIn PDF document text
    • http://armanetti.com/images/fawutetuke.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/247d3a024e37fe212ce6b81ad4d65592/54720434182.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92951a3b6c---10445638951.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2107161307427929118ngyg6.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/52784896547.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8079bcf6e3d91c575c37f2a474564e7c/4160788203.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/vudidakupel.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16093a4b26cfaa---dusidabozumumujazofefu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5816d2c0f1---pazufozefogidaninuzinot.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/71924827015.pdfIn PDF document text
    • http://vejwun.cz/images/96310449795.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b48a0af0b80---30456426194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=la+ley+del+espejo+audiolibro+completoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2D 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off00014039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14039 11012 bytes
SHA-256: 7bcf70ba6ebbd69a404200fb302823890ff11fbbea7c933cebcda94c28f03ffd
font_02_sfnt_off000159a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000171b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171B8 19420 bytes
SHA-256: 9449d8f6d766fe15cf60862235cd964f7f886cc3ae5a7e79a1aff03b7e3fc358

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