Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71a5e221ffc7615…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 14:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fbde7aa2f416f3a00c8eae00a52ddfdf SHA-1: 3791bde87959abe13a15a94ceb748e4d6003fc88 SHA-256: b71a5e221ffc761549ae8b6aa255528a918dcc1e7b3a6d0de52122b92bed315a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the execution of malicious actions or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=root+permission+apk PDF link annotation
    • http://textstricker.de/benutzerdateien/xazutotulejoxizopitup.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/45029102390.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/80908572776.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xobafobaf.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ded1a450bef033513329eacc5c4eb0da/20851630684.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/7904940196.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/vuwalakotozudex.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/nomasixodelegogofatiz.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/watesapakobakonebe.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/26079203771.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/92677550927.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf4c489ace---21869475807.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210910151725.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16142ea29c159e---44173282274.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/41258476910.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/33848717335.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/vesebabenofenu.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e3a460ce85e888021cbba1a111d83057/11563066970.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/texureta.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/rubirofumegedav.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/61327301263.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/54193179666.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/39878095218.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_off0000d7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 10504 bytes
SHA-256: 66ad0adbb75a7b809a62347377f32e2aeeaf3bef12ee000a764b23bd02271a2a
font_01_sfnt_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 21032 bytes
SHA-256: c5c84245c6ff85eef47c55ff1fdd8604c1c99c0347dbe8d13b6b8f7f77c4ec75
font_02_sfnt_off00012793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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