Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2d53346bb93982…

MALICIOUS

PDF

98.1 KB Created: 2021-08-21 06:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 098cd10e8b89103b88de81ca1e525920 SHA-1: df81de29d0647d787b8684475b30710bf2b795d1 SHA-256: 8f2d53346bb939820cff49eecda48585bef2e141767f55238ca66226935cd4ad
196 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress sites and disposable hosting, likely serving as a lure for users seeking driver downloads. The 'SE_CLICKFIX' heuristic indicates the document likely instructs users to execute commands, a common social engineering tactic to bypass security measures and download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://giovannicaputoboutique.com/file/94200394358.pdf In PDF document text
    • https://stopserv.ru/files/file/92006367067.pdfIn PDF document text
    • http://zae.me/datafiles/file/salabixuse.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/tuvezeku.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/jcps189aorqgj8r50tfvom3783/39738776948.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffe1fc367e---71386406339.pdfIn PDF document text
    • http://home-plast.ru/foto/files/negifaruze.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d95f231cdd9---gudegirigedeparevokerim.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082b016887f3---3299146446.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d18dbc54---peparaxetibejewoxos.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/xekafutikojatanemibim.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/791b6bff55d0f9bf274fa33d80a44dd2/98380938495.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/9ca07813f2dcbb1097de96f661d063bc/98232031232.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/tikasewogotavasog.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/48305815166.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6a9e93a68---mozutisovesulazisuxoxamaj.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/74932937753.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/xudolurizudil.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/rotesepejesesu.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/purepenoli.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/21202d5f3cef490bbb9503ecb7bc3cb2/rokusinolawato.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/redagewikuxar.pdfIn PDF document text
    • http://mulherinscampground.com/clients/879992/File/jibiduwav.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/ced7e9fd793107107687692f7d347e65/40512483431.pdfIn PDF document text
    • http://mesterek.net/tmp/84710644826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=brightness+driver+for+windows+10+64+bit+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11316 11396 bytes
SHA-256: c67d234249ded0672f796a9340819747854089fd6f1adeb8562cad88511cacab
font_01_sfnt_off00012dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDA 18924 bytes
SHA-256: 56b3cfeca87b9ef1d3081879245521e230143a69ed691e12734edb52c34e5891
font_02_sfnt_off00015fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1