Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c271f3d2107d70f…

MALICIOUS

PDF

129.1 KB Created: 2021-07-25 19:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 36113976cc1cb47dff3117f33e998cf9 SHA-1: 6b29e7f68aa343846e746244fbb9f106f2977ba7 SHA-256: 3c271f3d2107d70f08997f9c6207ef369e012f8e525a293a239c4246c4b689e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing campaigns that leverage compromised websites to host malicious documents or redirect users to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7093

Heuristics 5

  • 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
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfcf42984e1---nusaluvesabigigufebudu.pdf In PDF document text
    • http://associatedreclaimed.com/userfiles/files/degebotixirokabolefuve.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084646244421---paxixixu.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/6316b3169007641c1ea91ad152af40b8/14917339192.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/84625354738.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/aea184d4854a912770be15876e887f1d/jesodetisolubokelem.pdfIn PDF document text
    • https://maclashoes.it/file/kipazujawujawixe.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/cb3418j4i5gs172catkgr77st2/reran.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/52066744015.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9965e45d9---64576362006.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d7309db7d---75952566385.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/gobejilebokogogiz.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b273294a3---xefogipikamep.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b0828667b---rijinilop.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079d8a53ba73---fetotinukonumogu.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/21812288812.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/32ca5073f904f8356fdbe8edaff21977/xelorobixofamaxavonemabag.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/88286264711.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/34636715252.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b19f4492c6---mijizux.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacf3ea188---33564625477.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/zugegaden.pdfIn PDF document text
    • http://greenld.com/userfiles/gevifokuzagaxedifogugotuf.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/dinosovubopifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=cubase+le+ai+elements+9+crackPDF link annotation
    • 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_off00018135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18135 12988 bytes
SHA-256: 14ad3bc91ae9cb951f363f41a07f8e39f71647b20a1326250de5a7b84682ab3b
font_01_sfnt_off0001a8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8AA 19600 bytes
SHA-256: 1bdbf96dc244f58bac6483c50c44def84a58f990c5bcc4866940ce72319c9264
font_02_sfnt_off0001da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1