Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a04e42f7b7527e…

MALICIOUS

PDF

81.4 KB Created: 2021-08-23 19:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8186f79c76e4b00708ff8e1cd8eec52d SHA-1: cb9f1a6c1728530941dd32367d49afdbfe3088ea SHA-256: e0a04e42f7b7527e8b794194931814f27ffa8b485015653e583664dabdc1deab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable domains, indicating a link farm or phishing lure. No scripts were extracted, but the structure and heuristic firings strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://havanic.com/cache/fck_files/file/27565813256.pdf
    • http://www.abcklima.hu//data/editorfile/26659857933.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089838473b61---71344381345.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af090012830---nikora.pdf
    • http://suvagcentr.ru/userfiles/files/91773054323.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161001567c849c---34876951198.pdf
    • http://modern-pro.ru/files/file/20105730668.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095625310eff---nowabuf.pdf
    • https://myphambambi.com/webroot/img/files/sikatutekukur.pdf
    • https://majubesar.info/contents//files/banapil.pdf
    • https://corghialberti.it/file/sobiguwavovoxiwovav.pdf
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/zugiwogojukotinagediz.pdf
    • http://szao-spb.ru/images/news/file/34657970342.pdf
    • https://baptistfriends.org/media/23253232551.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed3aad8e1ee---xoluvotivelezaje.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/c30e70b8f5895c0d409c0530b0373ce6/62116014995.pdf
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/pipobifuserupurudevozi.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c5b825425---9259973111.pdf
    • http://alpha-cp.com/userfiles/file/91062405611.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/cd7640dec8c171be66f1a657f6ce305e/33930834418.pdf
    • https://wojczak.pl/userfiles/file/kovoxomalibofez.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/68l3j8ar8l3stkh3otl59dthid/fezurexos.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gr5be1hvocmfk10t602fvskv12/gituwugoxo.pdf
    • http://crystalcleanwindowsmn.com/clients/c/cc/cc5f591ab25ef7bbd7a205b431f39e57/File/66558712396.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=nordictrack+x7i+incline+trainer+manual
    • 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_off0000de4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 16792 bytes
font_01_sfnt_off0000f661.bin
fc8e6387f36dab45c02a42d04566182aecd4756b58584cc1017e2d60868cbb25
pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 10684 bytes
font_02_sfnt_off00010ee3.bin
b3816beed3c687a6121994d42aa1c99ae6f924477e3bd0b729a84bfeb35640db
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE3 15816 bytes