Malicious PDF — malware analysis report

Static analysis result for SHA-256 656c5b8a11825c5c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 19:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c412ef72ced0ed5eaedfe73989e4e2b SHA-1: eadc8eff411716f2ac4f249b2950f7d6409dca84 SHA-256: 656c5b8a11825c5cbd8040365431f5f59bf18e684edba09ce8d3a0b12b19ba55
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some of which point to compromised WordPress sites. Heuristics indicate it's a lure for invoices or payment requests, and also suggests a password-protected archive handoff, commonly used to bypass security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://tizianaiberti.it/userfiles/files/refatulasimil.pdf In PDF document text
    • http://df-2.de/images/daten/file/32346028827.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/98768400972.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/31242791299.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd4d1faad---38051547434.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/wonaruzutaxutirovazum.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/3acc3797125ef744e2adb9b09ea5ef9a/49752890609.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/zudikuvadofigomepizenev.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613024711b4e3---10476965172.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/47397281.pdfIn PDF document text
    • http://ed-union05.ru/files/file/91728586675.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/mivorivimom.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/temuzosowawanoxozavezuvew.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/58119609241.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/87995481706.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/kowilomagipomamisexun.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/fekapotijikevizowaja.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kulabujix.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/jewemikomot.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/95089195239.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/refovalapibafapoweded.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/rixevi.pdfIn PDF document text
    • http://demkapi.com/resimler/files/68704335093.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/nixomepomanazowobedutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=online+store+management+system+pdfPDF 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_off0000d867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD867 10980 bytes
SHA-256: 5a571dbfa8929f41466988df0e6338ec61d9db0309fcffde5d9e34365edebf44
font_01_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 18024 bytes
SHA-256: ac8659175f49f48c60f831c617f892182d81f1b810fc712f165690f866019e8e
font_02_sfnt_off00012080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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