Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f0ba7afe81d8f2…

MALICIOUS

PDF

76.8 KB Created: 2021-09-17 17:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0698b4480ce2b7b4ff20bd5735e9f323 SHA-1: db3c6d28f1be1694b72827d2b83072da2ec01325 SHA-256: e4f0ba7afe81d8f2333cd7b02b3ccba4a2215ea48dbb67d4c0b9caf7e3631181
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the document functions as a link farm, directing users to various domains, some of which are hosted on compromised CMS upload storage or disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crewmak.ru/uplcv?utm_term=best+army+of+town+hall+9 PDF link annotation
    • http://89928386.com/uploads/files/202109091916035137.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/72620934300.pdfIn PDF document text
    • https://avenue102.com/uploads/file/88779668645.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/zoridumipemidukutasug.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/33834827970.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614228c7be50e---77064154619.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/15628856393.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/dozekekomuduxub.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/ronalemeninufa.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/49e2d0b46c2c32a62ff07671460308ac/meravelalaxozabetirujoti.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/wudufudabel.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/xalalulikekenawowarilefiv.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf67c129e---97581252144.pdfIn PDF document text
    • http://surausa.com/uploads/files/2154521016.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/gonupurotuwipepadeza.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/boxasirisukizejaserom.pdfIn PDF document text
    • https://viettrungson.com/media/Files/kekevogo.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/savupagavufa.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/sojos.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/wevanaro.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/43957983991.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/vuzinolawoluzuwawuzoxoroz.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_off0000c6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A5 17676 bytes
SHA-256: 3eba377ef7d5f79b352ee6e6ad5ddc3a73417f4f69343544e079f7ebd886c0a3
font_01_sfnt_off0000f4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 10808 bytes
SHA-256: c4dc9cc2e9b5413a2e2f2faec9be7827914d0b568a8da2a931f05acb8880b60d
font_02_sfnt_off00010d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1