Malicious PDF — malware analysis report

Static analysis result for SHA-256 2925b09b74b63532…

MALICIOUS

PDF

73.3 KB Created: 2021-09-16 07:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9f77e1958ac1186de7bb06c8063a67d1 SHA-1: ced35381fd29493daec5245fe05b5e06e617e992 SHA-256: 2925b09b74b635321454b62cae4ba05a9c8af08f659023577d75007d917182b2
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. The file functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites or disposable domains. This pattern is commonly used to distribute phishing content or further stages of malware. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7fcd40a23d379c9220ca6c99a4bb70f1/93286748142.pdf In PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/0tnan02lf7d11gg07tago2fef3/rukolimenaku.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/pemagaparo.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/33745690540.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d89c00e6a8---wufavisut.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/2664247947.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/bizeru.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/71905120704.pdfIn PDF document text
    • http://findusafranchise.com/files/files/porijedo.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/42422348181.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140354329d2f---tajosipirobesuvopisotefo.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/34647668412.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/gigevutozimunokerogazenaw.pdfIn PDF document text
    • http://cartopack.be/Images/file/tepekamuwejuzevemar.pdfIn PDF document text
    • https://dcimx.com/files/52630421385.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16133faf5cdc60---lesipojatusarejowo.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/pitaxetuk.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/b763b7581fb5fb5bc30f38d27b2a070f/fasirabumolabosagikuv.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/8938624812.pdfIn PDF document text
    • http://vswet.ru/f/guropuxaferibupedeboxo.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614164628f524---32032244276.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/df585ae01e25acf09052a98e112da102/gulag.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/gidadediren.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210908115434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=music+maker+jam+apk+full+version+free+downloadPDF 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_off0000bb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB55 11148 bytes
SHA-256: 5c5aede61d5aa092c826f0cb500de1fe6246bcfd1e6f300c29801fbf212a298e
font_01_sfnt_off0000d557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD557 16272 bytes
SHA-256: 034a3fe8cf105f930b57c657f42087062a772780be738ad69f5824419d54cb03
font_02_sfnt_off0000ff59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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