Malicious PDF — malware analysis report

Static analysis result for SHA-256 99918aa338b9b8e0…

MALICIOUS

PDF

78.0 KB Created: 2021-09-20 07:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 235fcd169816eb84cd9484fafe2316c6 SHA-1: 7f6d74b4f9e9c6a011ff22ca98a7f4dd6dac08d6 SHA-256: 99918aa338b9b8e00980d24a251e4cbb4cb0eb089dffb6a7ec78da1832a45e0d
204 Risk Score

Malware Insights

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

The PDF document exhibits social engineering tactics, specifically a 'ClickFix' style attack, by instructing the user to press Win+R or paste a command into a terminal. This is combined with a visual download button lure. The presence of multiple external URIs, some pointing to potentially compromised CMS upload storage, suggests a distribution mechanism for further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • 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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://gamax-motor.cz/data/dokumenty/pejuriwumejapitipuwi.pdf In PDF document text
    • http://hdg-gmuend.de/userfiles/files/21277869700.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/63441107906.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614418c85c64e---xugoluwizasipap.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/71534188472.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/85487073113.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/10770123189.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-15/20210915174820657653.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/61244150941.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/95921557403.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/xejakeraxelu.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/13763229368.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143f2d56ab8b---pifixirefibudawel.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/54401528050.pdfIn PDF document text
    • http://ty-int.com/files/files/guwexos.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/mitudukijosofudibanufa.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/velizej.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/legokokexesakir.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/wowogamesezarusatidovibu.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/91036166971.pdfIn PDF document text
    • http://farmina.ru/uploads/files/72602572690.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141c9e811222---norivuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=download+the+sims+4+dlcPDF 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_off0000c7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E4 19344 bytes
SHA-256: 9197a5ac19ea852bc5b6ed86efca745cbc43dc11d9dd1980be1caa7042abf2bf
font_01_sfnt_off0000fa21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 10700 bytes
SHA-256: 0b81b4d74385054d1130ee367b4e3e924f866c1c3d74853abc1c90df392bf6c0
font_02_sfnt_off00011290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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