Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de8e180d7f3573e…

MALICIOUS

PDF

85.9 KB Created: 2021-07-22 13:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 90ad74a30f053dc7c986a64cf4a5cb84 SHA-1: ddbbaf96025dfa8377e207a7d483c880487b8997 SHA-256: 4de8e180d7f3573e6efe591e8b8416db3a1320f8d6a60b312d55764c5b974405
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The file also contains numerous external URIs, many of which point to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c395bec206---82528226875.pdf In PDF document text
    • https://themalc.org/files/file/lopogikotabulemu.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/a7832cf957b00d88eaf05e408d0daf95/43030986587.pdfIn PDF document text
    • https://tavio.ru/files/file/73666176227.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/f0998c111da92a1e4341002d613c68cb/pofegisif.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/54901752850.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf8fe62f39---36291920108.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/19776260101.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/24f9c7e13a3bc8651f600125f60e0290/59001865420.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/a1761647e41040ca78167316c9612951/jijogidadipidobefo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d933a14846---71990699549.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607154ee7c293---56604181749.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/nodimujimixofamuwikinu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a90a905e08a---55164398695.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/wuzaduvon.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16088e10ecc237---94083040847.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/bavifefefonajemonuwuleji.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/37d3b161f31cd94b7664d612da9663fd/83167568899.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a4696cb3f738580931d1b16f3c2020f9/mipokodapimamekus.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/d559fa6dec79a5605aeb9e4d33342211/janoni.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/zumipiliguwula.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c481dbd8e85---rabumomawazilu.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074c20fa799b---wabomelena.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/81cqnp331ir6g2e6d8cps7aqi3/xametenos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=big+rock+riding+stablesPDF 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_off0000ea40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 10828 bytes
SHA-256: 74cb4f0ea267119a6e915063612e290a84d798f57b17789f142adbf0c01b9b5c
font_01_sfnt_off00010335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B47 17336 bytes
SHA-256: 5de26358792600655e45e128068974338c9184db8473d88ac50a68ec2b94dd40