Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac895ccfdabbcf3e…

MALICIOUS

PDF

103.9 KB Created: 2021-08-09 19:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8b66b97bac72ef4acd65db90511959e SHA-1: bdf5d8030c665ca574c344fc5604baa3a51557bf SHA-256: ac895ccfdabbcf3eb3900d837b4723380ba26bc55b4599f25fbce0df0ca9b807
156 Risk Score

Malware Insights

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

The 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 pointing to compromised CMS uploads and disposable hosting, suggesting it's used to redirect users to malicious sites. The PDF's structure and embedded URLs strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c719e346876---26080176203.pdf
    • http://hotelgiottotorino.com/userfiles/files/94580579536.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609862eba514b---tufodixava.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1486b1bb89---30144222652.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/tt7o6mvk2d58hbi76am8a4lr57/rodorawokaxejenivapaxixe.pdf
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/9256379550.pdf
    • http://aloeverajuice.cz/files/file/zoxon.pdf
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/sedonevabevawavopedug.pdf
    • http://lignumweb.com/site/webroot/uploads/files/kivivu.pdf
    • https://ottopianos.nl/files/lubonigamud.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e938de1cbdf---suvuvelujol.pdf
    • http://sp3siemianowice.pl/userFiles/files/50575089504.pdf
    • https://giorgiosantinelli.it/file/28078314604.pdf
    • http://criminisiepartners.it/userfiles/files/68311431515.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f41363c18---vijuvufawixuxedamuxewiso.pdf
    • http://toyteepee.com/uploadfiles/file/210707002605776612m2jypm.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe86cac444a---23291612301.pdf
    • http://pappteam.hu/userfiles/file/40084122842.pdf
    • http://ankurgroups.com/userfiles/file/guwomarikizaxobu.pdf
    • http://baigeleather.com/userfiles/file/60691160201.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/937b59658c7dca30d082ae0e11c00671/68271635976.pdf
    • http://helderlive.nl/ckfinder/userfiles/files/mokevoxigorebifiwivirovu.pdf
    • http://zetrade.cz/userfiles/file/22288726015.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=que+significa+la+palabra+contrato+de+arras
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011169.bin
ff5122c772425d424deb51a1a7d251c97ba1bf48db59bb0afd697fbbe76db421
pdf-font-stream PDF embedded font (sfnt) at offset 0x11169 21028 bytes
font_01_sfnt_off000146fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x146FC 16792 bytes
font_02_sfnt_off00015f13.bin
dd15016e96b75d4d0cdde59ff35bcf7ec348f57b6cdacec82eba077f11ef36cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F13 11092 bytes
font_03_sfnt_off000178ba.bin
9dbd86b547c789e693a9447677f94902def939eedb7b34c80af7161f7c191d02
pdf-font-stream PDF embedded font (sfnt) at offset 0x178BA 16148 bytes