Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3554c9f3685d276…

MALICIOUS

PDF

88.4 KB Created: 2021-09-02 09:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 252fea1823631cd896ee831f79aa6b13 SHA-1: 174ae00e2e5fa521cf828ac85c2e207c2a63d86a SHA-256: b3554c9f3685d2766d24eb17c46e94d6dbaafdbc4da8a3292f0e70ffef3a726c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and potentially compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators confirms the document's primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=40+dollars+in+rupees PDF link annotation
    • http://shengyaweb.com/uploadfile/file/2021072315334990.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/dopopatetejamu.pdfIn PDF document text
    • https://thietbigas.net/media/files/nugimed.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/sixowef.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/834b63ed4466d5fe800ce1b38e1329cd/94746102738.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/nuxoloralilaruvuguf.pdfIn PDF document text
    • https://linoforti.it/file/didika.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/jagizitavajoge.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/pojotofosupujolulosonad.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/xixujop.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/16cef89cae16a22b9a7b14718fb02df2/72150443380.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/79683256103.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/firapa.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092afe2b2dfd---99629777237.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/11755588140.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160878d0eb410e---fikewofatolobelawu.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210531034523.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/82318231196.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d4a24fcee---sekusisoxinu.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210723034802.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d022fdeede---40593675155.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160858fecd74a4---91353263102.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/nogobozam.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_off0000f74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 10488 bytes
SHA-256: 8b47abec43f380761c8de64c47ec2ffbbcaa5edf0a706b784f8ce337807ed326
font_01_sfnt_off00010f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F23 17184 bytes
SHA-256: 269d99557421062b2936630314a87291b51a7a301978d147d5148bb083a2a8c7
font_02_sfnt_off00013bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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