Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6fbb59e1e5fe24…

MALICIOUS

PDF

87.9 KB Created: 2021-07-01 15:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2e1d10c3fd29bec6fb69525375038aa SHA-1: a7fd4d66307534194696d82f9f3a15caf8554233 SHA-256: 8f6fbb59e1e5fe2457a866a9de21273ca26388901400410de973b93459899734
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, utilizing compromised WordPress upload directories to host and redirect to other PDF files. This technique is often used to obscure the ultimate destination and evade initial detection, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/4c3469467c6710fe79e41184c67a1d02/61968445774.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b81efb05---jebuj.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b09cf9b18eda0efe4c7bf3de5b6f485c/62442766801.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8aa180923a4f61af4502e902484ed915/sexasepoviked.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/4vqv5a187ufcjgkmr7k0nhagno/ruvuxabidonoboboninafa.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/7s5mpfb46ugq94dlo9hv760igd/58195573718.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/pufutumijezumexunaxon.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/9548fb4a7d484bb3933d32026ec45cd6/xajugazifugokisanugune.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/d628f370f23b76b51ae17a58635f8409/meximofoxosopoxu.pdf
    • https://equator-maritime.com/userfiles/file/38303457805.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e461e780648f9b3a416e8e4c2b6510be/27939708549.pdf
    • https://coil.hk/upload/files/11697221751.pdf
    • https://chupwo.com/editor_upload/file/mawudes.pdf
    • http://xn--e42bt3l.net/upfile/files/2211772966.pdf
    • http://suapaiatuipelehakefamily.com/clients/80707/File/14700322294.pdf
    • http://zatexpress.com//upload/userfiles/files/33585750406.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609691f717ccf---walew.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/dariwapixa.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/4t5v9hf43112f3po0ctgidf011/zaxomalu.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-22/20210522130723611142.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/a26f3e4ae8983fbdf1d7ed659729c52b/11736312245.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea8ad6054f---waboberolovepisa.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606d39257987f---69897463864.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=action+pictures+speech+therapy
    • 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_off0000f4be.bin
d92297b5efd560c7cd3f6eb410a68e96d3684dba3787799c1b5adf3ae7e89ce0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 10620 bytes
font_01_sfnt_off00010d15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D15 16792 bytes
font_02_sfnt_off00012527.bin
07cea487d4060949eeee8fa73e07c8a1d5bdc3751a844877c01a3d866b2db1a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12527 17444 bytes