Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a623538592df2eb…

MALICIOUS

PDF

78.1 KB Created: 2021-07-22 03:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db8630ee19501b53d995140d3fc4e226 SHA-1: e218114f692598f1458c4a95df76a9bf9c9bd1d8 SHA-256: 2a623538592df2eba97f695157a0548aca92b838055cb385f7f6e506c70ddb35
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to various websites, with several links pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7632

Heuristics 5

  • 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
  • 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://mindentudor.hu/userfiles/file/45284484771.pdf
    • https://sanaspinler.com/calisma2/files/uploads/kajogukoxijo.pdf
    • https://dbmotorbrokers.com/userfiles/file/75676274005.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e56a7d91f---75699341440.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca1991b31---kobobizijep.pdf
    • http://fatamorgana.fr/uploads/assets/file/17457731097.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/10670311b1c0b1c02bf665d6ddd081f8/jigijuwinexepuzozetofez.pdf
    • http://ebiocell.com/uploadfile/file///2021061715480744.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca41e509848---degosiwukiguf.pdf
    • https://brawlcall.com/ckfinder/userfiles/files/61770597775.pdf
    • http://anapro.com/ckfinder/userfiles/files/50736795038.pdf
    • http://dsagco.com/Upload/file/kesemiwokajakovopewured.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a644a14b96b---movogan.pdf
    • https://businesslife.com/content/file/mifusinipixoregadini.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4717aebd7---79877576431.pdf
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/nirawimav.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/bepevekuj.pdf
    • https://torgradio.ru/new/files/file/mafekajutebi.pdf
    • https://secolink.sk/userfiles/file/zeropupe.pdf
    • http://katachizu.com/img/news/files/1339855649.pdf
    • https://tuvanthietke13-5.com/webroot/img/files/41942421831.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/u35kbseb15539mhf1u7ts60gn5/63578161624.pdf
    • https://torbay.ru/images/uploads/file/85455188506.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=new+level+brewing
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 16792 bytes
font_01_sfnt_off000109f3.bin
e6cb02b44860ed4ba3f853984726481e0f8d73a0cfa03adb12544db55b5cd09c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F3 18088 bytes

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