Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb6f4ed90988231…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 21:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 707618d948684a014af34ff5df6308cd SHA-1: 8cdfd47a391e861e70bd497eec94f825a7c7ac82 SHA-256: 2fb6f4ed909882313bf2e72e285073d00f30be78e1e1a4ebd79adf0e6bcff7f9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. The SE_CLICKFIX heuristic indicates social engineering by instructing the user to execute a command, a common tactic for downloading and executing further malicious content. Multiple URLs are present, some hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=latest+among+us+version+pc+free PDF link annotation
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/vevisawegilasefamiz.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f27535ff94---25395674941.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/47820069890.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/nazuvoladixejuvarita.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/86816215378.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210902_0C8A8DBD04455247.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614174b1607a8---ximojubedumumilevalekil.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/23311591653.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1e25ab963068230a990c940d2c0fd50a/18665118519.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/18231859981.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/49332586173.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16130355e0647d---47840539896.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/61507414952.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/fedexolekumoja.pdfIn PDF document text
    • http://corkpotters.com/images/5714945080.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/jajidolisevib.pdfIn PDF document text
    • http://dytac.hk/userfiles/jamosurasexolepez.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/88134146131.pdfIn PDF document text
    • http://servmed.net/userfiles/file/sixiviziruf.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/6322583051.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/26477733310.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/20060928262.pdfIn PDF document text
    • http://104408017.linker.tw/files/nujudajafabok.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/73205538126.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_off0000ccf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF2 19048 bytes
SHA-256: 65ed58b34a17463e0254a6c2ae7efaa60df891710272bffec6167faaf9ff26f9
font_01_sfnt_off0000fe5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11673 10900 bytes
SHA-256: ce091f07fe5ed4ba6e368dc8a8fc40748bcc9d3fb2345667e7331ac901c800cf

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