Malicious PDF — malware analysis report

Static analysis result for SHA-256 834a03de2fc26735…

MALICIOUS

PDF

84.7 KB Created: 2021-07-05 20:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e31582006e85ae308bc51df2297b46a0 SHA-1: 65b2bdbaafc2828e04fbf4c5691a185213d7b9f3 SHA-256: 834a03de2fc26735462a2889fb1581e914f29994ca1396576df44c25cf3fcc0b
236 Risk Score

Malware Insights

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

This PDF document exhibits social engineering tactics, specifically a 'ClickFix' attack, by instructing the user to copy and paste commands into a terminal. This is a common method to bypass macro restrictions and execute malicious code. The presence of multiple URLs hosted on compromised WordPress sites suggests an attempt to download and execute a secondary payload, aligning with phishing and trojan delivery behaviors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://smidgel.ru/uplcv?utm_term=changing+motherboard+and+cpu+without+reinstalling+windows+10 PDF link annotation
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a383e57d871---nogawawofan.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/65639163449.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/0844067ea6a54cf440b32881045a3b91/tudawedodigulogov.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/6ve4buuc6aookgbdcb94credeu/dudevobomowekav.pdfIn PDF document text
    • http://446888.top/userfiles/file/69713936164.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/sekoxavenifikugeno.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/56066312379.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/rukiwifujiro.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/44704897174.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/1fc383b4da975f39a9153ffa4d8b2b12/vexomekigipuzikiz.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5841fb5bb8---gisoloru.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/29526610712.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/59e7079029aed462bb7f3043c68d56c6/nufedawipizobeb.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/cngd2999vifj52c6p8msj44lur/82452784593.pdfIn PDF document text
    • http://placc.info/up_image/gexokuzixezomobas.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/tumikoxun.pdfIn PDF document text
    • http://www.centralperdana.com/file/zovebugizokomaz.pdfIn PDF document text
    • https://digireg.cz/upload/96696006193.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/lk2b9dgf38sfmkrq1122n4soim/35421251561.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608dba28c6ad2---mijurulunilixebawufo.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/xufavawolip.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_off0000e6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 11492 bytes
SHA-256: d8993e7b2a19f8ffd34c0ecdd09b8eb73cfa160d992285a6cc2898d5f4b23e70
font_02_sfnt_off000119a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A7 16688 bytes
SHA-256: 44449b9135cc30628089ccf04a69876e7570a038f876a92607b864a9c6495feb

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