Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78a8da55c1a87f3…

MALICIOUS

PDF

84.6 KB Created: 2021-06-30 20:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7f899955fd543a61566a156f43e1c550 SHA-1: 9c6b41cda4ff813fa460e1922e13288389811782 SHA-256: f78a8da55c1a87f3f3e2218dbecd49ca2634ee1060bccdf0e6006f7a7f7e9375
236 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It employs social engineering tactics, specifically a 'ClickFix' lure, instructing the user to copy and paste commands into a shell. This is a common method to bypass macro restrictions and execute a second-stage payload, likely downloaded from one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://drafthe.ru/uplcv?utm_term=factory+reset+windows+10+without+password PDF link annotation
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ac9e2601204011051846641425ea8262/wobomidufupuxufamirujabid.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/77387224168.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16085091764a6d---fusorunijufupewewapun.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/1327723702.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/pvib5tau24ibd257r3c4i0edn6/xuxoxurujovojotilojoz.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/sute2jq34g8plpde6gaqhg9p7k/52204343707.pdfIn PDF document text
    • http://qa-whg.net/upload/files/23319080999.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/v52m4j28uqhgfmj4a41v81v961/pidovagetorowojufani.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/bsdsatkenuiemp666ghd05rjrd/mivoxesoxijetitapawu.pdfIn PDF document text
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/rurefojoxavewufuvugalu.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/33426252118.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/1530a86444557679b279936e27984fad/27178439814.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/c0fmliv097ekgpvguo0u5l21ah/44683732429.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072cc517e19e---34635386466.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/raxabibizegoxeruxide.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/geritukojijabed.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/171451899.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/gidedebomugapit.pdfIn PDF document text
    • https://aokman-drive.com/d/files/70879334707.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/4nu1bekischo103t2t9ikbmv40/82576035303.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/iq3gb42tpl9b31pu97f9lk7s8e/15196238472.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/talejonekaro.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/27e07189054555eeb5c6e0cba46d341b/tijuse.pdfIn PDF document text
    • 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_off0000e705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 11016 bytes
SHA-256: 47d08e1e2cdc06f4863faf0817290a61489ed7cced3b573d69ad14b7f5ff4482
font_01_sfnt_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C2 17032 bytes
SHA-256: be89ed0181bdd7ae123d26d1ab8b141ecb6eceba139677334e87c64b10bc9db9

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