Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95e6a8c8f1084ee…

MALICIOUS

PDF

71.1 KB Created: 2021-09-22 22:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e15da1001220d320441ab331dbe12f82 SHA-1: 2670d00ee1ad3a2f3739dbae1f90245a237c882d SHA-256: a95e6a8c8f1084ee19fd9e19ce10da11116564075a79f9770807b00e2f12e823
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to other PDF files, many hosted on compromised CMS uploads or disposable domains. This structure suggests a link farm designed to distribute further malicious content or lead users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=new+amapiano+songs+2020+mp3+download
    • https://stabiactiv.com/userfiles/file/xoriwisigakowusavoxogi.pdf
    • https://kibledergisi.net/resimler/files/lozofituzokepurifip.pdf
    • http://biblioteka-belzec.pl/upload/files/pemoteponeruwukabotema.pdf
    • http://dokturmice.com/ckfinder/userfiles/files/nofufameponudilo.pdf
    • http://cokhixnktientien.com/Images_upload/files/69654753074.pdf
    • https://angelsforwarriors.org/userfiles/files/suwafu.pdf
    • http://worthingtonpark101.com/userimages/67379046426.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/889d51eb887558413713087edd487e00/81463234550.pdf
    • http://kesherisrael.com/uploadEditor/files/97018706149.pdf
    • https://ghadir-eng.com/userfiles/files/gapilomarizavesokim.pdf
    • https://florerialafloresta.com/ckfinder/userfiles/files/11567363846.pdf
    • https://escritacontabilidade.net/fotos/news/file/32165909528.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/sesisodiwalutakuxezuxeru.pdf
    • https://peisheng.org/uploads/ckfiles/files/612f8642b95ca.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135b039589ed---45757565511.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/ba054a4ce9fe20e800136e5dad23b509/5545650729.pdf
    • http://nhatrangpalace.net/app/webroot/upload/files/34321626753.pdf
    • http://xn--e42bt3l.net/upfile/files/21607325044.pdf
    • http://af.ssla.ru/images/fornews/files/79397067801.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc5d27f4bb---23858334368.pdf
    • https://stephankeppel.com/userfiles/file/tadimuvimidavofuzifipe.pdf
    • https://atlanticcompact.org/userfiles/files/35136807071.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/14764192547.pdf
    • 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_off0000b4f4.bin
0b0662d1f570b8ff6e85e069cc64add6cf1972e54c5bf925af60d14c479a8ea7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F4 15888 bytes
font_01_sfnt_off0000dd68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD68 16792 bytes
font_02_sfnt_off0000f57f.bin
4d7a449ceed6a19a8b32c3d9e7b16f6177b64b2e8a486eecf885def941fc95f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 11016 bytes