Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c00222b0ecbded2…

MALICIOUS

PDF

79.4 KB Created: 2021-07-10 08:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efcd2cdc725757a8face87788ab3299b SHA-1: 0e8c63e0d750f1996a2aded111df7c26381f0a8f SHA-256: 9c00222b0ecbded2cdbafbb0f6698caed5a5f57d9808e86f806e70f5877aee0e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://alkanboya.com/files/file///95506054534.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089f87640791---77367347631.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077887a2f812---sigijuxiginileno.pdf
    • http://ctkupavna.ru/upload/file/kitozalef.pdf
    • https://condominiovillage.com/userfiles/file/dupavadimik.pdf
    • http://amadpich.com/userfiles/file/wirumalugosopisonowo.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608246bf2b804---80224941436.pdf
    • http://messtores.ca/fck_user_files/file/55710581373.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/0381b6b0bf883dc19a0d4c9e08f326cd/kubitagoratan.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/fn4e6u56og16daehjel1jbedm2/98748446976.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6ec02a815---9372821709.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/55dfhtskmdmqh204kekfod21g1/51075589205.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d165bc7c13---82548180070.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/78e2601879351a6610cf5a75f6345720/41996853552.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaddc6acc2a---xadanepimokoniram.pdf
    • http://cioccolatogallucci.it/userfiles/file/55963461941.pdf
    • https://almuhja.net/ckfinder/userfiles/files/16791764048.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3df0169c2---tuvurunifepavafaz.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d4c09cc69---37424047531.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/eos7afhan8ipispk01ag5kml65/29928944276.pdf
    • http://amctop.com/board_data/editor_img/file/202106291227.pdf
    • https://caribemed.com/userfiles/file/79672780613.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/hapjsohmkf71lne6hkmnh316a1/99121503238.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/63a73b856db33cd246183e0c2cbd098a/mujoxuzibimavumolepaful.pdf
    • https://2acontractor.it/images/file/46640377664.pdf
    • http://holyfamilycyo.org/clients/37654/File/navanov.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=i+see+you+standing+there+in+your+hulk+outerwear
    • 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_off0000d5be.bin
fbd8298a5e4b6cb5a1e3a91fe55b25d0a5939ea7f24cf2b0afaff7d11e458ccd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BE 10868 bytes
font_01_sfnt_off0000eea6.bin
6d8b890d1a1d3a7735283131f8e2ae159f899c4c43a97f910fb45bc312e44d9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 15904 bytes
font_02_sfnt_off000117bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117BC 16792 bytes