Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8094c215f92d9a5…

MALICIOUS

PDF

72.2 KB Created: 2021-09-15 03:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8ca38088c84c81e5146b41f7fedb0e9 SHA-1: bfbb0395225741d523fce1c5d9ac6ec3bdd9ec7d SHA-256: a8094c215f92d9a5e375877ba664f5baa555ead8a97b73f3b95f19c878d09bd0
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a payment redirection lure. It contains embedded JavaScript and numerous external links, some pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading and executing additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.
  • 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://irlanc.ru/uplcv?utm_term=fake+account+number+generator PDF link annotation
    • http://topliving.sk/userfiles/file/tibedolejatizedixobip.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/todorakapexaluruse.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/81190200566.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/guzoru.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc4b244f3---sotoso.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/28243956014.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/95295769506.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/76091930715.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/76084131173.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/20539134907.pdfIn PDF document text
    • http://cissi.it/userfiles/files/87078890950.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613686ba84be0---nosirobakuzetilijufoxoze.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/65456728383.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/donaxoworaxinegobakixix.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16141235880085---67310445561.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/liritaxubokufad.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/81244602189.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/revatowopuw.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/50101815918.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/vajot.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/banefevosazujawutasajenor.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a06aa4108---boxodukotavu.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_off0000ba21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA21 16020 bytes
SHA-256: cca1d54e3deea513fdf84a0dffb3032d7a7965fac553c34de5c9a144bd574de7
font_01_sfnt_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 10576 bytes
SHA-256: 443dfd010acd07faf57e24b62cddb7b86244c8cef2c925aa79785c9aa011866d
font_02_sfnt_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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