Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b669a6baf2fcc65…

MALICIOUS

PDF

95.6 KB Created: 2021-07-27 23:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b86b3a69988960eac8b71b900b29a69 SHA-1: a68fe843ae133cdb3ebe28eb2cbfa0fd767b3ce0 SHA-256: 0b669a6baf2fcc65ce7f3a6b9e54186b785a6850b7a33c19cbc53c7d7188a172
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress upload directories. The document body is unreadable, but the presence of multiple links to potentially malicious or compromised sites indicates an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://songhakbbq.com/uploads/files/girolitanumove.pdf In PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/sapibidavaseno.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/03p1jfdok0oeps2h2r7clavhdq/medutagufat.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/22468008723.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d23d16ef301---12093865890.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/ebf6516221084bdfa08ffadd014160a7/jopefajewerubarerufopiki.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed19c2f3d37---80269043312.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/guratedo.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/61918368831.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210630062655.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cbdf5ba4e---didafopoxodesosimo.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7b0d1c50366b210f196d0b2af1dd1ad6/tenodopevenipomewokadak.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/45749097124.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/72243641526.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/61310466733.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/tawudixemikekixifusereb.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/ruritu.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/waxewobetitiwiberajubo.pdfIn PDF document text
    • http://bethelcommunityone.com/clients/880032/File/22466455869.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/o5a3unb392a8dgp55rimh3g2g4/34651330718.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29d202801c---81067018260.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f33030638a---tilebisaseg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=barron%27s+ielts+4th+edition+answer+keyPDF 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_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 17356 bytes
SHA-256: 82ef85bdd2e3b136b94f3b2407ad4ebec89c1373a63a0dcfd839ac3f3543a194
font_01_sfnt_off000135d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D5 1696 bytes
SHA-256: 7f55d8009fdfdbdeec52dc220bed4ddb4b51a5ca209be666f9c86086dfbd34f2
font_02_sfnt_off00013de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000155ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155FF 10800 bytes
SHA-256: d0cf74d8b20da69a6f76d266ed7086a732dda65cc96b43438adebef15398140e

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