Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5aabeb2245c361e…

MALICIOUS

PDF

85.9 KB Created: 2021-07-31 13:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a88074c6aea8f266e25f614738d74da1 SHA-1: 3b22ccfc788221bc1dfce6aeaea7552fd297fce7 SHA-256: b5aabeb2245c361e53cde555b0987e4e96e4d53b64edc490dab199b3eda47be2
124 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 exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true destination or evade detection. The presence of multiple distinct hosts and the structure of the URLs suggest a coordinated effort to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4986

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 https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966f7e37db5---zutesa.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dea94bbb7df---99202474080.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16070c8922e0e8---11954555863.pdf
    • http://bearings-home.com/userfiles/file/lopeverekovavupofatipepo.pdf
    • http://nousgarage.com/userfiles/file/37117309723.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b90dd92de2---sibujefetuden.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ff40dc2e0---48039081008.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/h6d83c3rda57rts9seti2lsfg7/kuwilax.pdf
    • https://motacademy.it/file/49089502606.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ad216dde1---bixituvume.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/e02da68788287b4bea3a002c36071e8a/23775268784.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a501a4440---62599116516.pdf
    • https://bleikss.com/userfiles/file/36360318785.pdf
    • http://zulassungsservice4you.de/bilder/file/jupojiseguxuposetedaginu.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/34o0aljorp4r313e1kq988o771/24340589194.pdf
    • http://www.yoko-ono.be/images/userfiles/file/murasepuzupiw.pdf
    • http://apexnepaltravel.com/userfiles/file/6419771762.pdf
    • http://douzonebnf.com/upload/file///gedoxuxumeron.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c895fb479b2---92635556767.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd4982d69---nobanodarukenijekosa.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a301c395392---xisixedarojufumomaj.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732dabb77da---64326532128.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/856b1458e8bebbbc029fe222807c217e/6954035217.pdf
    • http://augustaelectricalwork.com/editorData/file/zuwamifutepafekatizi.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/df3dcc4473d3b64543b5b75014fddd88/kufakojena.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f5c0b2010---fizuderow.pdf
    • http://netinflux.net/userfiles/file/kagedivedakano.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=surah+ar+rahman+transliteration+bangla
    • 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_off000101e7.bin
9a891ed833e4185761098556b198b0c680cc0ac613892f051ad767e64ef5cb21
pdf-font-stream PDF embedded font (sfnt) at offset 0x101E7 15764 bytes
font_01_sfnt_off00012a5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5F 16792 bytes
font_02_sfnt_off00014276.bin
d07bafd602b44a35365986a1abf1246ece5bcd89d49a124ae9bd89bf07850343
pdf-font-stream PDF embedded font (sfnt) at offset 0x14276 10868 bytes