Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8f49af1b33ce9a…

MALICIOUS

PDF

106.7 KB Created: 2021-07-12 17:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e986fba2f06bed40abeec20c8c2df2b SHA-1: ac38aa669673654c1fa665003b652545e491b59f SHA-256: 7f8f49af1b33ce9a8b90c8c6335f2f24261742dd27f6b0b6e083211b6d093c73
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites, some hosted on disposable domains or utilizing WordPress upload vulnerabilities. The primary purpose appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://chayka-svg.ru/files/jalurifamavililijunasu.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/adb6dc3d335c6ab0cf1eef18e3a62ca1/51676713211.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a572ef64a17---kevesobunoz.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b117cc38217---gukonu.pdf
    • https://bursakaynak.net/userfiles/file/50173842248.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160724e73456ab---77910647262.pdf
    • https://kochitaxirental.com/ckfinder/userfiles/files/250716936.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/7750b919e85997bc723da738b8f843eb/josafubalupuviral.pdf
    • http://kapelski.pl/userfiles/file/82380185876.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/a4e22865e834c0383fddf57ee219ac1f/88549445115.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/hvhk0h3o2qdldllibv29h28iem/pavunikoluvafisobifumu.pdf
    • https://doktor-ara.com/userfiles/files/616523153.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160960a634d2f3---162074704.pdf
    • http://bajcsidavidfoto.com/_user/file/209856658.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074f977492bc---10230667462.pdf
    • http://verduciautodemolizioni.it/userfiles/file/fenelawipoledeviveji.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/47da9ac2e0b60be5acb0592c20997a21/14747378766.pdf
    • http://biomassasia.net/data_ed/userfiles/file/11175231916.pdf
    • https://travelsafeway.com/userfiles/file/16307574837.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cc86af00836---70832503638.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948eeccd639---10000832528.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/0qs2c9eq1k9d4bnmq2te4lojra/50735040966.pdf
    • https://tepihtrava.rs//files/jafetufutibegutob.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/847c30bfc794fbe4f50a26be659d94bc/bapipeg.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2eac627ff---pimilonase.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075195d48b22---44811288680.pdf
    • http://c-amc.com/upload/files/mumululagowimelukopenonu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=writing+off+child+care+expenses
    • 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_off00013e47.bin
086d11bb51e51fb13ec09f7b118db399f4840269f1961f7f9484a119c6fe3237		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E47 10992 bytes
font_01_sfnt_off0001578a.bin
adaf12f8d315a2060ed7bf6356e3d418ecbdaef2b1be8ddfdf2453bca7f9c892		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1578A 17892 bytes
font_02_sfnt_off00018518.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18518 16792 bytes

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