Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e16610ce26f3596…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 09:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a03cdbe083598db09c84e1c715a2de2d SHA-1: 839315f3f43809e643893ed871c8297d91a48b32 SHA-256: 5e16610ce26f3596957834187e863e0087c795bd7126f6bb30cf29ccf8bac654
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised websites. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://schodylux.pl/userfiles/file/wizimovesow.pdf In PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/bd0e56fce09b257961fce26965e9c234/dexasotidebolijeti.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/litofifisogutemalipix.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/36183157271.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-08-03/6a3a18cff8d228d12581cc912a14a435.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/81142191314.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/1490091204.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8462da0257e2ede3bd880317403abd06/reperudavupukivubekuwasu.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2a2b44f59a516fcbb655c4ba62d8213c/nudijoropapitub.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/kirarusobifirogisur.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/kenobejedovori.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/telape.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/56195798762.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/fhg6ubejcgo3oh6j7s7oui1ce3/pidiguf.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8aba3a27c4---1276548889.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/9659435443.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a25cce9f43f---dasirakaxig.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/fudowimewole.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/41244429479.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/61323270271.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160833328a261b---75359438474.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/velawulivegefikeduwepisu.pdfIn PDF document text
    • https://evboosters.com/wp-content/plugins/super-forms/uploads/php/files/14bd386f0fd7c9f2d7115ab4126a75e1/nubovudepufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=msc+chemistry+books+pdfPDF 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_off0000d24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA66 10912 bytes
SHA-256: 07cdd3fe9da9b1b1351c6b27d1aafbc210953a3bd651b9b10d4f0e61f1983805
font_02_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 18408 bytes
SHA-256: c439a3307057ad536c3374b974094b51dd04deeb53c58cbdea62707a27937593

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