Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39c7b929e7c4e29…

MALICIOUS

PDF

79.0 KB Created: 2021-09-08 00:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0668d67df70a30eca881eb7ae8fd5e99 SHA-1: ad6a6e855c1730f4a8f1d80c18d15629f1febc0c SHA-256: e39c7b929e7c4e2933c192db261dcb94a940f5d1519ca9fe659d28e28cadca26
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6973

Heuristics 5

  • 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
  • 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://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/4cjd011si6anl5psd015vk85o2/70366875287.pdf In PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1660680825609fc26519f8e.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/c7e9f698e6abbb2e0cc8cd9b5b37b1f0/remijogalujelu.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f32221b2de988959f74cbf2db80a9cfc/laboxevifabose.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/94389364639.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/kapixig.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/h1gjr2i70s1eq2ampk5odu4s75/74694298489.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/56027862904.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/rekiruri.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/92962751809.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/59099378832.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/suwujez.pdfIn PDF document text
    • http://live-net.it/file/37109374432.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/93219554083.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/fazekerenatu.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/dinufirutok.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/72302781041.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/xevebedozuninoliduf.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d372ef8b---poguwivetigodabitopi.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/rixaku.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/80747525227.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/nixilufolunotupajexamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=grammaire+et+orthographe+fran%C3%A7aise+gratuit+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D0 11236 bytes
SHA-256: 17287298d07f92843aa0f65ac7fbbcd8babd0335ea2ecf3f2ba46f7c6f0e7e4d

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