Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa9ab5c8b26cde2…

MALICIOUS

PDF

89.6 KB Created: 2021-06-29 00:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4ae75c9c8372b98d670dd3d5f6aaa027 SHA-1: d9c0a611c5c54d2f0277b48dda2b3ed69e480bd4 SHA-256: 3aa9ab5c8b26cde2be5488fe09ea415ca7ec61f133308c3a0c747e828e6fc8f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://pistant.ru/uplcv?utm_term=how+do+you+put+a+name+tag+on+a+animal+in+minecraft PDF link annotation
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bb2cdfe31---dewusipez.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/kesux.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/762590ffa39a8ea9c3c82aa193fe3c8e/lenak.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/4dc5f2d29d41d4008d40d0ace6cebed2/nosej.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ac0df034e---filurufegapewife.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/ecb8acd8d782291a2ebbdde3ef296d10/zabemerakafowiwedop.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/p8ro15kc415urs45oqjopqndps/lixaxuletokifuwumanake.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/f3067c9b192e9f03a9c8648de779bd74/52393128401.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/e03646bc1dc26f863f884895e7bc1529/ladupuvapopine.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/32498795400.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/sutizefasusimovoxuledoja.pdfIn PDF document text
    • http://topas.lt/userfiles/file/48330514116.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-2/20210502183206356529.pdfIn PDF document text
    • https://liderpin.com/calisma2/files/uploads/4910674938.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/vafufotipewafuvawikupiwul.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/413de01e83416ba815140d898abd71da/54379026655.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078efe758819---neguwodusukevemez.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8a0eeeb23---saforujotalesil.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/86659959195.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/bt0dr5np8gh51u090tga1k7kht/4468875392.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/48e5a1a7bf955e6655434f5a33817b7b/jusepopukir.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fc67c9df6---fuzomurisegopipo.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_off0000f632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 11088 bytes
SHA-256: be43bdfdf5ec7a2ed5fe1ec3ec6e386a0e8bba6faf3708c2dcb3d54314121717
font_01_sfnt_off00010fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCF 18480 bytes
SHA-256: ceb20aa7194b1b1d726c1cac9f8bae44851b029129ac420049993fb73b1101a8
font_02_sfnt_off000140ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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