Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8bbafd6240dbf1…

MALICIOUS

PDF

77.5 KB Created: 2021-07-14 10:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e6c00869a1ab3fa8ae75d2f500cff6b5 SHA-1: ea4e2d040a3f6d38c1761e2e5278ab4cafd046e5 SHA-256: 3b8bbafd6240dbf11b853a48587e722483f225dbab9e677fc00292c484cd57b4
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO spamming operation. The document body is heavily obfuscated and does not provide clear textual content, but the heuristics and URLs strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/1c5iq9hvh8n84fc8ks7nukqcdr/36837400260.pdf In PDF document text
    • https://getracemirates.com/userfiles/files/lelifuvuve.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/xisepo.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/pobori.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf64c27f665---dariranodonizemupa.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2fada3f6b---wibagezalawuzesari.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f162de71d1---wudaxomidomi.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c657b10105c---99882632753.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/2hrrvknd1tnlo8hilvbec80ogu/1370451913.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d94d84d72---pegafigapaminufiwokabuli.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/92490364270.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/c7ec3126a9a946589a92868c73b6dadf/18802241386.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/19699791365.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d65749a8b---73830424452.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/9112009474.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/1025e7527353dbee7f6f9cbb2752668a/38576032732.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/82shm48npdrmsk7ts3qch8h0v1/29627765978.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/faberoradiv.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/60115234290.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fd65e4305---69366867723.pdfIn PDF document text
    • http://benetalent.com/upload/files/bexilitu.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f53cda055272a96202cf643fe6d57eb5/niwax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=most+plastic+surgeryPDF link annotation
    • 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_off0000cdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 10652 bytes
SHA-256: 7f7873bb1a73a957bcd5bdd343f8efa0451c7a448578a140ea0469e7afb79528
font_02_sfnt_off0000fe7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 16032 bytes
SHA-256: d37577d39adc38d3918d576bee605432590d31eb117ef383813d780e9a31c5af

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