Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ee37b08ba41f687…

MALICIOUS

PDF

76.1 KB Created: 2021-09-16 14:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b803e245882a63849b5517767a46c42d SHA-1: 87d141b7576452f36d7b8644596e2d97328d2035 SHA-256: 2ee37b08ba41f68737701925fcbbf9c8cb5e5a86dcf4d55b2a32c46ce88245e1
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, several of which point to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/95724898562.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161368c5744917---voxelopukajopagosinelor.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff42490155.pdf
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/labozakadaboguj.pdf
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53747639682.pdf
    • http://live-lessons.net/lcj/web/uploads/assets/file/32738713521.pdf
    • https://fizjolech.pl/userfiles/file/nepele.pdf
    • http://fishtech.org/uploads/userfiles/file/file/32154279442.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/4041802597.pdf
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/5193534052.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/eveorm8o2cs1dmpv921csrbi3s/kumufajasiwoxu.pdf
    • http://candemdientu.com/Images_upload/files/56451651825.pdf
    • http://sahrugs.com/userfiles/file/51937285495.pdf
    • http://jungam21.com/upfiles/file/1630782226.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161325d24c929b---gulofevikeg.pdf
    • http://clinicaveterinariasangiacomo.it/userfiles/files/33442474156.pdf
    • https://divinenine.net/userfiles/file/94875075318.pdf
    • http://hulstcustoms.ru/uploads/files/30886054841.pdf
    • http://rileyillustration.com/images/agency/files/64728151043.pdf
    • http://dglytbt.com/upfolder/e/files/20210913045827.pdf
    • http://jiachuankeji.com/upload_fck/file/2021-9-14/20210914161837251808.pdf
    • https://snowcat.pl/admin/ckfinder/userfiles/files/46240341972.pdf
    • https://hiperaktivite.info/userfiles/files/49229229008.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=amazon+prime+video+unlocked+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D0 16792 bytes
font_01_sfnt_off0000dce2.bin
fb61aab98b19e0baa8abedf4272faffb7e83bec0639ecffda5661940f2f9db2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE2 17640 bytes
font_02_sfnt_off00010a6f.bin
bf522f0c1a275d2d9eac781b269e51eb06333290a86b9f3c07ecee90a28e7c4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 10708 bytes