Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2fff05cc497c2ae…

MALICIOUS

PDF

91.0 KB Created: 2021-07-02 18:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3f84adac6d94e8ca65da7a35328bf793 SHA-1: 37ac0fd03357b8fa2227639dfc3cb6dc3601c7e6 SHA-256: f2fff05cc497c2aeacdad7de3e698e6c72542a03901fc8dfa0d5113d16484f0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs are embedded, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded URIs are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://philabc.ru/uplcv?utm_term=werribee+river+tide+times PDF link annotation
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/hfrgf1984m03jfcrs063edklej/zutipowakofoxotinikebidub.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/zazakimelovofefef.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3724b3d80---movagixufipugewode.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/linexatatulipuviju.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087c22c2a8e3---webebonuniguz.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/3552f3f87f0788bf1b5a40a665d47fe7/78174766201.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a4591ac2a573da9fcd1f5c20ae8bc7b6/dovojavajikolojupujopaja.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1625185584.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607be1338fa58---60421807338.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/vuxijazifodulib.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/9uu1jqbapse5rfb1u4fv0vo0gr/44960235834.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/97645244765.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160847492bea96---xobogalitadopijil.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16086fa3327bbb---71239023610.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/0d85c91159d4ae7a154ba2bbe4f3e123/35354518188.pdfIn PDF document text
    • https://asi-filter.pl/files/file/gikon.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/6bbde267f567a777b8f34c5b61e102d3/rirunamutujudokev.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/25029718387.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/9eq5rojrpo53st00skf47mj6dd/69752915542.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2dfb5164fb---tonakozipidut.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/5607264bbd5e4af66326ec6c24fc45b4/lavudiwoluboberadef.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/saxuxofusazezegiruton.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ebf04146---9610422442.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_off0001046b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C82 10176 bytes
SHA-256: 9e312304c7d72cd6eabdd18f4ce0be81cde9ce5ca6955be4e2045d36886a9c50
font_02_sfnt_off00013355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13355 17168 bytes
SHA-256: 46e346157163e8912cc672be1682661b5dcb1b231377e3cbd2df22eeb46fab80

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