Malicious PDF — malware analysis report

Static analysis result for SHA-256 8146cd2a9da978a2…

MALICIOUS

PDF

95.6 KB Created: 2021-09-15 18:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0a8ec244e418f70201754b72a0ea864e SHA-1: 21ff49cb136bbcdb643825436f8b766caaacfd63 SHA-256: 8146cd2a9da978a24608e094c2354d45ea818527e66e011900069a814f1b0c5f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The presence of a 'download button' lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The embedded JavaScript likely facilitates the download or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://garglob.ru/uplcv?utm_term=gls+v+apk+download PDF link annotation
    • http://abhinavabhishad.org/userfiles/file/fuwosobarigagenowaxiku.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/86690148701.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b02775b1f580bccf14f81721d7b89068/tapabavozafu.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/dcff2534a6c8400738b9e5a42b34b3fe/96793408481.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/losisowibusiruruve.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/gowubuzo.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/jemoretutarusop.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109080022416729.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/tudavapuvetepumobejobe.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/guwadiwopomudutapasideku.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/gimovolomitikumu.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/87470825517.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dc4bb7b89---wunavaragibeti.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/38577129596.pdfIn PDF document text
    • http://gazetavk.ru/img/file/nenepivisuxisopive.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/92865944958.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613488069f983---12845364079.pdfIn PDF document text
    • https://fivetc.net/uploads/files/60206147565.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/65dppk6ca2bish7ihsv0undp54/gukerakebuxitadasiworose.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/pewuvipugokote.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16137602b86e36---roxenabogipuwalesadixeduk.pdfIn PDF document text
    • https://emprenderem.cl/files/xasawevunep.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_off0001104d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12864 10244 bytes
SHA-256: d661fdf1f5caf1b760455dfb5854e5bfbe1555cf25c23e131444791ca4392feb
font_02_sfnt_off00013f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F97 18324 bytes
SHA-256: fe16e97ab4d5f826bce55b044cfe0da9c5fe8bac5685c082e5e48faa2c7e9a1a

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