Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61928cfbb8ce467…

MALICIOUS

PDF

93.6 KB Created: 2021-07-02 13:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8e394c8f93986e7254b8c59c891dbd15 SHA-1: cacc68738ab710c2b68fe8cfa4774561ec8fa97c SHA-256: a61928cfbb8ce467c362823243f3f76e721ca1b6bc25f331cabb76e888de2d76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous links to external PDFs hosted on compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of external links and the overall structure point towards a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://smidgel.ru/uplcv?utm_term=seventh+heaven+idiom+meaning PDF link annotation
    • http://lt101shop.com/userfiles/files/46826368509.pdfIn PDF document text
    • http://dgjst.com/upfile/file/12654722665.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/vixadepar.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/nf95td2epdh9s1asllna58cn8b/zeradufetitugoduwozo.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-2/20210702022456496631.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/bifimabimefijuxabofune.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608648eadfafc---53394380314.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609aec2da1e9c---ridozoge.pdfIn PDF document text
    • http://megaeventoa100.com/clients/f/fa/fa03970f5feff24be7017758158681b9/File/84312085400.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/53174679372.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/31260725666.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd35216970---kobuwupa.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/guviloxewawakifupamakumo.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/lerezevakiruwukowefu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8bf526335---98240556476.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/jazoma.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096978b0d26e---jutegopipikox.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/kalupipunexogipodejun.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/mizavoreminitiletu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a814271be92---xilugakixafakiteduzo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5a8090b0e---zupusirobunudokuludixa.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccb7e676cd---puvifoxofosipudi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a54968fbf---kekaze.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f4d9e5f7ecbf2e76583370cc0027b601/94077748967.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_off0001088f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088F 18916 bytes
SHA-256: 0ecdb384eaa4888c403656a04f3a75dcf30137efc3188b136816f480289a76a3
font_01_sfnt_off00013984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001519b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1519B 10524 bytes
SHA-256: 584b7ad84eb71bb38c2f3fb8717561c3bb9361dcb69ce217dd804f780f4ddd81

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