Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb80d1950b25431…

MALICIOUS

PDF

81.2 KB Created: 2021-06-26 02:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7e2fad2384aa769dc98c10216882404 SHA-1: 50b087fa23d27575caa5680d21ef0fa427781560 SHA-256: 7fb80d1950b25431ad7a6917c94638b269c1a4c5c9f9e9a7bbe39162d7d180c1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing lure. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://smflow.in/admin/uploads/file/29468713235.pdf
    • http://somsit.com/ckfinder/userfiles/files/10294500381.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/tosik.pdf
    • http://aivieksteslaivas.lv/userfiles/file/1929584558.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dd1384295---nameduvurifodo.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/vgfs72dggq2v74r7jtf5sq1h7e/ropupikizumako.pdf
    • https://lescourailleurs.com/upload/editor/file/67029264752.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861b2517aba---tivonipiweriluwadige.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c7d83ae1a---tiwujagelutuzigu.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e93086758d---zipepivafofum.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/shtj82q93l58jcil39t529h1gi/tegazedapasajuto.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/8d4917ae7b41d0b0d3f19c67817fc0eb/dusigawanegiralewikizib.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed9a634e90---86765429165.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/66dfd7e9092617e7f7a3ac1a7a18f10b/39425348210.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/716c978605e29383039a6086a8b30cf5/nukilitetemonegekuremoxep.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/4tnfju4nmfq3rg20um8hl531sg/43541063152.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792a1e63c2d---bixupizokezufofaxaw.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/b72f13f096e2decd397cb1e21a463923/kuwikutin.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce8a802619---fakexekafevidifodepu.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/l4jtjgk90126odk8dvqer7vc1h/wisugebugatozuk.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a29177536---50772077917.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160959c8e44a69---57714337815.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=directions+to+winstar+casino+in+oklahoma
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DF 16792 bytes
font_01_sfnt_off0000f0f6.bin
debb3f1aee465eea5d945a97693a956ff5e9d20ec408913cf5dfbacef4d1cf65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 10672 bytes
font_02_sfnt_off0001094f.bin
57ec7f2618b9159bea4c54a78e4b5e6ce68ec65f85884fbeefdd326cb93936ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 17848 bytes

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