Malicious PDF — malware analysis report

Static analysis result for SHA-256 950fac6bd5b3378d…

MALICIOUS

PDF

75.1 KB Created: 2021-09-07 17:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3b2b8dbe851e415641e10270b8e3950 SHA-1: ae2f79ba2e87219c1492e8ee86713fc067be395a SHA-256: 950fac6bd5b3378dc2cb6c0a257142fd2aede426c0cbf31640fa7bdb292a4a37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://laborke.ru/uplcv?utm_term=inovance+servo+drive+manual+pdf PDF link annotation
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/vofifakoxogetujebaji.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/segujemurotenas.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/kazivugikediliwe.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/gutorevexaxej.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/tigefovexabatadimagi.pdfIn PDF document text
    • https://mmszke.hu/files/file/wuvikamewevisizu.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/visozukadugodivizar.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/71670474279.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/rulawokopozemagisojixa.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/93019655073.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/386a32d10b271bdd1d3726cbaed23382/lukitobot.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/65264433189.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/7il4ktco6lrfo7du0jsbb6cu61/18039726389.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078d354612f5---liwinefikutegu.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/gaxegidozifatosekidoroj.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/safibifaranudomutesavoru.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/21e6f8153e8347974e0e954a8a33814f/xutudero.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4eb361557---41463013920.pdfIn PDF document text
    • http://atiksigorta.com/files/95914623785.pdfIn PDF document text
    • http://ctm.it/userfiles/file/penuwirinovalafudedab.pdfIn PDF document text
    • http://trivio.it/userfiles/files/56085388085.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/kebumafuzaguzonotujife.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/528b6b40bb0a729a19172ddcec2601a0/64355434369.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b634b7db129---44861907742.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/10520366715.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/94799189780.pdfIn PDF document text
    • http://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/73701510180.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_off0000c43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 10800 bytes
SHA-256: 42b91218c9e11818c723d12500041c9010647bd1c56d3f536daf07ea13b393fd
font_02_sfnt_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 16168 bytes
SHA-256: 4ff4896ae77d2990c741fc511ed2a5fd1a0854f5b7c3b88eb519a465c37dd9da