Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aec36eb4b7d5216…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 03:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b12a3b39e8ae93d8afeae4bdd78c3c4a SHA-1: 094d755abfa87d35abb86a56f7e54030d83d03b3 SHA-256: 5aec36eb4b7d5216ecd0d70b8421ae115aeb40c95a0ec796335cd9ab3ce22f5c
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple URLs hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of 'utm_term=download' in one URL further supports the lure of downloading content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://chelseafoodmart.com/uploads/files/rutiraros.pdf In PDF document text
    • http://icoenergia.com/userfiles/files/gigaxemogowi.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/52990072994.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/rabefexu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366133b351f---pomomedazisije.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/89412566956.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613765ea23b98---rizametoze.pdfIn PDF document text
    • http://ccadl.com/files/20210904222608.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/jvsvj47l1vdd2ui5hdlgaqm4s0/bodofexovapukukenifopa.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/19315250119.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/lizuwobunuko.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bdef10e360008b9a514a8ab26e790a56/dawumojofefugiziwokutuve.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/36389273047.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/5128035341.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/nigadurisoj.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/75236112119.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161307c1facd78---nudobo.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/93393174684.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/motopijaga.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/67588325874.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/20185503374.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vurodokojowasexefulasop.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/farokuwobokinafanewaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+ld+player+for+androidPDF 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_off0000d723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 20032 bytes
SHA-256: 8f6a2357c9ff8173b2c6c405123d642dea55dc77702c6aed680b11060df7c71d
font_02_sfnt_off000123b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B6 10424 bytes
SHA-256: fd1b813fe00387d22574e9b297cbca21374952670429a5286b79458a4d3a538b

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