Malicious PDF — malware analysis report

Static analysis result for SHA-256 065535637bacc8a1…

MALICIOUS

PDF

89.8 KB Created: 2021-09-19 11:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f109fb447b78d7d9f56a17d724d0be23 SHA-1: 5a6e380e621f3bbd236a7c21e8f92089414767f7 SHA-256: 065535637bacc8a1582f985e34bdaf4f11d2d03b8961080c6db9ac50836a18b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic firings indicate the presence of a link farm pointing to compromised websites, likely intended to redirect users to download further malicious payloads. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://files.ibiza-ferien.de/file/zotivojurila.pdf In PDF document text
    • http://aprt1day.ru/file/sodidomilirut.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/visofenusu.pdfIn PDF document text
    • https://emenu.hu/editor_up/pojetatulariwisu.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/18884820679.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/dewejulajojije.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1b67353fc67edcaf44792d2701476a1d/nutekiselakiximaver.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210908151324.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/54673920192.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/37068777480.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/dolat.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/38282800543.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/bazibirat.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090915150073499.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161301796d80d5---vukeguwonidobonido.pdfIn PDF document text
    • http://esejsc.com/upload/files/77576947735.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fffbfbfc35---jumitefaxuxilofuj.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/83812872810.pdfIn PDF document text
    • http://shamayachts.com/upload/file/33025713474.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/wisubu.pdfIn PDF document text
    • http://dhf-china.com/d/files/51793983797.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/sozilibanam.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/zezuf.pdfIn PDF document text
    • https://cakkue.com/contents/files/tigivorimo.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e126a9b281---7059790948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=demon+slayer+episode+1+kissanimePDF 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_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D33 10712 bytes
SHA-256: cd58d2e42e943552ece861dfe764fb03e86f1cce7ea8c95f608c4f54b8019952
font_02_sfnt_off000125c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C9 19724 bytes
SHA-256: 30932a75c664f4248662316528adcc2e99e32e44aa94a9d27bb060b5fd433e63

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