Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad2929de8d5da8e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 00:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 34fd7c05d363632f6cf4a85163d09730 SHA-1: 7cbb736adb492739f1f76d681e8148deb656a7f1 SHA-256: fad2929de8d5da8e444faf3d066bd37c5f6f350111358da8637b1e0baaa93fca
276 Risk Score

Malware Insights

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

The PDF employs social engineering tactics, specifically a 'Browser Install Lure' and 'Password Archive Lure', to trick users into executing malicious content. The 'ClickFix' heuristic indicates instructions designed to bypass macro restrictions, likely by prompting the user to run a command. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the download and execution of a second-stage payload via embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://huntic.ru/uplcv?utm_term=how+to+unblock+sites+on+a+chromebook PDF link annotation
    • http://a2kat.ru/userfiles/file/77972582098.pdfIn PDF document text
    • https://argumentua.com/i/file/29928948606.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/vigogeviwotewilozalula.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/26837603710.pdfIn PDF document text
    • http://leton.pl/userfiles/file/pukejukoxa.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/50725949764.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/vobukajesipiwu.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/vopesowelurulowal.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/zavifexagu.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/5qfc0hmab5hjutimc7egh39dnj/gapewaz.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/tamotupivavixuwifaxejitak.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/jekelur.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/retawok.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/5b63fce7dcfc1575f8f2308a2fda2c74/68420294939.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/sotivatagufup.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/18097282616.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b272ad0efb---22839273973.pdfIn PDF document text
    • https://tempegaring.com/contents/files/vusevosodadewatisiko.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/raxazoweb.pdfIn PDF document text
    • http://word.mn/uploads/assets/74979576983.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134f16e248fa---gebizakavasanubefifav.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/gekigerananemon.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/dodokesixokiwipuronagori.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/subujumaxeruzoriwuji.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/5db00918bc5c69a748ecb35dfd600d36/45689700399.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_off0000d922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 10904 bytes
SHA-256: bb597ed9cb6bf9a650ba0c889915a9d09d62b3db0d4f7226e4c0773cd9da7172
font_02_sfnt_off00010a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4D 19160 bytes
SHA-256: 2bf26333b85315d9dac4d8f1c010c95d5456e45ee0f68205f7b4f85b363c4214

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