Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d37566ea753146a…

MALICIOUS

PDF

87.5 KB Created: 2021-07-03 16:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bc5d89189d715bab053ede0441cbcfd SHA-1: 035d6ef0e91fa806a5df519bd4260624339d1131 SHA-256: 8d37566ea753146a5b72268f78fcfc91fd7bac109ffe11e4ddb1a5a2546026e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://chinocorporatechallenge.com/clients/6216/File/72132386248.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a080411831e---jawetopezazugizowepesi.pdf
    • https://ebooksweb.net/files/file/56253688680.pdf
    • http://primebrokeragetx.com/ckfinder/userfiles/files/zopip.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/86f6b13bec6da1ea701f50f4d621b281/3495418709.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/019220577fc34678dd9b54ece38ed806/15929407122.pdf
    • https://tecnicadovolante.com/images/file/30251423054.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bq421a2tdt1tq6ia8rftnvldq3/32174970892.pdf
    • https://svingenieria.cl/userfiles/file/balopidadefavukepamimu.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/mdf4c00k98u4rungt0br9ko3nk/sulakakegunu.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7b6e41765bb50e050f782a3117e15439/78523231732.pdf
    • http://zrdb-drogbud.pl/Upload/file/kufunuginimiduvisot.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/8bne2ji17gak9kcurbks6k48t4/95089547707.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/lrt5pmg9lnsav128rtt12dv024/55811657394.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac96afa0c---44140623117.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/bpmrviskgbt1hpp1ssafdujtaa/10143081378.pdf
    • http://barcabianca.eu/upload/file/85902449286.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d7ff593e2---xobovu.pdf
    • http://chnli.tw/CKEdit/upload/files/3666589499.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b840a1af7f3---voluruvijajajugapopupelaw.pdf
    • http://jrmhandling.nl/upload/file/kunuja.pdf
    • https://menu2uplus.com/images/file/mozorizevulunubaxasepivu.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/ne0ie78vs91dfhql1a6r5512i3/kakolidameluduzofol.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f4cfac8dd94c44637ab135cfef62d716/kufekabinoxiwepediz.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086535678b12---sitisapipapapoponidifaf.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700fe3619d8---55230676007.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+change+uefi+boot+order+in+windows+10
    • 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_off0000efe9.bin
c0d79a7f51a940c71fbbf7eaa82fc6ecd7757723440061dacc1c63c23b9535a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 17044 bytes
font_01_sfnt_off00011c8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8E 16792 bytes
font_02_sfnt_off000134a5.bin
4e7e0965882813ff6d9dba795b7ae3a8dbcee8ea2e9778cb641d87783d2049c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x134A5 11200 bytes