Malicious PDF — malware analysis report

Static analysis result for SHA-256 7877b39630e6c612…

MALICIOUS

PDF

86.5 KB Created: 2021-09-14 04:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2aea378eee298ebff28e23e82a28b37c SHA-1: 3f9e1722dc1af79908bc6f8047b0be78b322ce05 SHA-256: 7877b39630e6c612b5cbc4b92c5422b99d27b7884d7cbb07f11b772d690615a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs that point to link farms hosted on potentially compromised or disposable domains. The primary function appears to be redirecting users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://vp-dmsh.ru/admin/ckfinder/userfiles/files/melilodidatigobemilobizo.pdf In PDF document text
    • http://phdpecs.hu/userfiles/files/68331129791.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/92645811541.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/99382532343.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f772804f41---giweturexebeku.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109100222273677.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/kizawekaxokujofabizelal.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/73933583505.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/68383179776.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/30301569125.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/golilazinasolulabik.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/91270176029.pdfIn PDF document text
    • http://brenderup.ro/mm/file/64198927915.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/96982570691.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/93912392992.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9215fdd6---wolagakowigerix.pdfIn PDF document text
    • https://ekransamara.ru/files/todibe.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/75481808764.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/79311678582.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/lajomupifexamivalug.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/mobunetig.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/66310883732.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133b11085b95---dewafozevozes.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/75396040063.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/joded.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/3090048559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=most+popular+cell+phone+gamesPDF 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_off0000eb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 10820 bytes
SHA-256: 0a6f2c7de3c897f97f218bb68bc39af304513c46b20805674c976fe05ff6bb0d
font_01_sfnt_off00010469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10469 18120 bytes
SHA-256: 7a6a14d70567a1e00dc2523c3a6d1ea656a8617b37156f8fc183e8b0df02b9a2
font_02_sfnt_off00013403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1