Malicious PDF — malware analysis report

Static analysis result for SHA-256 1caae9d7a69c78fe…

MALICIOUS

PDF

83.1 KB Created: 2021-07-06 00:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3a4860f64d12a35697f40d42d980caf2 SHA-1: 58d2de5a3cc2fdfded491ade3bfb6cebc3f6045b SHA-256: 1caae9d7a69c78fe1cc595e2b2b8f36e774080a01b3df5b1283622e0b23be360
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=attainment+of+objectives PDF link annotation
    • http://metapolar.hu/tmp/54967958149.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd2890f480---pojowinibemodulezono.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/7129053739.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/gepigaxujox.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2020.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/volaguraboziwubebupevak.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/larufili.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/34285460401.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/eab6a2ee242f5066b33151baf540ab0a/sunupoxixifixesilame.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ekchesq5ikl4rn0bje4b31obsh/liwupet.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/91374625954.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/33f79facee6ee86598499f2870df0bae/mimejorisisob.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ag792ae3j1pp86l6fnbn3pl7f2/14449650697.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/70561691360.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/18125181594.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/54ce909f88bbee6e56feba15dd120f4f/dimosugazepadili.pdfIn PDF document text
    • http://naucseto.cz/storage/5831038049.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/ej9pes5claq7upshqpsdia8pg5/90233550025.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/tonuxiliga.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/79007105003.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/8394418158.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/s33555pqm9j5paqhqiuatfjr62/nazubujixobifo.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/gunosaduju.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/oniebmnr3a9hjtglnr8n210ke1/3239418514.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_off0000e43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43D 16428 bytes
SHA-256: ea143ddd746703171e64aa907a7d4b9f1c2404fdead72ef05d037f72cdbdcea0
font_01_sfnt_off00010ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED3 10668 bytes
SHA-256: 579868916c5799c5a7ee76fc0e5b898133e94774e9311c0d2f92527b43835b99
font_02_sfnt_off0001274d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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