Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e746c6e4903353…

MALICIOUS

PDF

91.7 KB Created: 2021-08-15 13:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 2f8e42453b8a2ed46d45c6202ca31f7c SHA-1: 656df60dc2b2c2f36e0ca8378f17d5dffeef1a4b SHA-256: 85e746c6e49033533cc3b72c407e0078693cbd112fa9861de8deaddf04316e12
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and exhibits characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to phishing pages or download further malware. The PDF structure and embedded URIs suggest an attempt to lure users through deceptive links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier clean score 0.2092

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 https://crewmak.ru/uplcv?utm_term=cual+es+mi+nahual+zapoteca PDF link annotation
    • http://graciaindoutama.com/kingkong/userfiles/files/rebunopojigudofegebuwev.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834200846fd---musoledo.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a53025ab1---47286608091.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608999ab42714---5785664362.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/721736653.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/mlks6bvltnd8mi6nqh8t8b96m0/28739623829.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970590408d9---88168546498.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/62e982fr9bkc4pfg4u4ttq6u81/papuwagepajo.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/xepomi.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160adb74515857---gozovogawejisa.pdfIn PDF document text
    • http://industrialdevices.in/uploads/sabototuwobetawub.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/vasomuwuzakuwunukufos.pdfIn PDF document text
    • http://katachizu.com/img/news/files/34543585320.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cb04828b4---64804496619.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/sixuwefudekejejogemi.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210530041727.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/27899200049.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/52356024903.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/xepomaxagizomelemavagufi.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/wefijebomud.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/sadararavesuzudux.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/wazurum.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d39d2b19b3---32178314973.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/42696296339.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160947c7ea9499---26972560716.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/givufiliwizigafu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13848 19532 bytes
SHA-256: 91ba5be9c83b1099b9c2ce57a14cee50e01cc67ef6bbc954c64d902874538f7a