Malicious PDF — malware analysis report

Static analysis result for SHA-256 f096b2a5cef17869…

MALICIOUS

PDF

90.0 KB Created: 2021-09-13 01:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c70af17c16e5e30476a3687d8a39c618 SHA-1: f01d59dc5a0087f37ebab26a4ba81ab0606de667 SHA-256: f096b2a5cef17869363f0b23809cef9b18e63847fa6ce3eb79db972021b52255
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://pixomot.ru/uplcv?utm_term=how+to+print+a+picture+to+a+specific+size+android PDF link annotation
    • http://amandatravel.com/userfiles/file/78232513586.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/52867647134.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3b7b642997070a01c45d2924ade1d392/fodudunoxinogojinosesew.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/fapetox.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/kajov.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/10508933519.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/jugofe.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/tikalexoxavuzuxodokitu.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/22259464720.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/71211989058.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/bazelijorexarinuzol.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321cec25f03---kavevimomewexisiji.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/46806195612.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/lituzulirutotetulisaw.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/18847828345.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/50878313053.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/jumomavatofagifumo.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/70601890510.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/jovawi.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/41721456397.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/segodokubufatov.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a4326c23---82699132813.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/74430329315.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/dorajefivovimovopik.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_off0000f91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001112f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 18476 bytes
SHA-256: cba3766f13589fe1d8251d0a5409aed5ee0afc9f63bf2e16465c1096e77be8f7
font_02_sfnt_off0001411e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411E 10804 bytes
SHA-256: 7d80a15a7e8ead2b825129ac45dc857c3c98bec6df581c2cc1faadceb5d5dc22

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