Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fa377c4b2ed08e…

MALICIOUS

PDF

80.1 KB Created: 2021-06-25 16:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 71c286177978b64cf72beb942723e963 SHA-1: 524c8d74a0073515d0a77c43ba02181641e7e0f0 SHA-256: d8fa377c4b2ed08e84f08c3269882190e46976dce879419254a76f56b373464e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. These links are likely intended to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c602216fc1---24085357876.pdf In PDF document text
    • https://advantagelic.com/singhania/downloads/file/nimanosibizop.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/4c3f5998af71465a4c8da81e4b33d14c/56057894803.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/matimiwawaf.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072264c7562e---towenanoxezivefewujebix.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ca55c39b---liziregulitasizi.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9d19bca50---93852139139.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/97799228228.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/jolidejip.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1add5988a---zonorofudebonijebovabuvo.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/24151834032.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/7237040955fd13b29a317b41a406166f/dunarumonube.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/95be15288a6ba3f0138ed2efd7b1752e/xenogesanaduvikimis.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/09879b062d590e21d1253899cb324af5/xolidisa.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/8n96qphp9jg82sqbffbh0q1n5p/44665496144.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106242233338515.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/60208608893.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/tasubiwerapudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=wild+fish+and+chipsPDF 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_off0000d957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 10260 bytes
SHA-256: 3ee5e0d89cede6f8533ced3a8e35d49231ff2207d5632558f4a0b474609822d5
font_02_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 16660 bytes
SHA-256: b5f3f938d2392aad5601a4c7cde891c03118be35f6393796cb8a158c070ff683