Malicious PDF — malware analysis report

Static analysis result for SHA-256 911f860a1442ca90…

MALICIOUS

PDF

86.4 KB Created: 2021-06-26 04:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7927b64ebebf687cb40c34fd503af81 SHA-1: a4f60d7b42269f1b7af38698ec90ec9c8e0b5a93 SHA-256: 911f860a1442ca90076c3e7da94324867d691b0b643b136775ed953e427843e7
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites and disposable domains, indicative of a link farm used for phishing or distributing further malware. The ClamAV detection and ML classifier strongly suggest malicious intent. The file's structure and URL patterns align with common tactics for luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrive.ru/uplcv?utm_term=how+long+until+snapping+turtle+eggs+hatch PDF link annotation
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160886e78ad539---xeretedol.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/39804383506.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d1de7dc71d0909c668dcf0e6d381a2df/dosomilujigiwamugi.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/7m51pgbn182c8a8f8uhg51frt6/kebariwigexuderanupus.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/0f8043e4912ec0a3c67d2cf3e8e22150/95422254037.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/5laeab0sp4kdvi8de3qghoalf1/zuxifiwakegobozavifunike.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a677265cfca---sofoxonimotoz.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/kapotinefunirigofon.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/bc89a5a00b230546553f39be16118ffe/gotoru.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/7aa4448ad1fb76f972480d462357a63a/53162018974.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/62f094bc8dc714783366d35a2c8da81d/voberapitanatijiruz.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/japulapuzofifosetip.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609775495e7c7---45196431500.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/tafisosopevozolawepun.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd5a7a8d01---nomegezuvejutazugowakoli.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/e6cfd6f74f819e4959b98b78be1f5eb9/41072492844.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/nirokovi.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/opl39vf61hla68lre10s3t1gk7/sotatusagiv.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d15a11b86f---51560636040.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/95900423878.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/046ea179939afc9b282ef9ad5f9fd407/fogebiratisew.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/95233507527.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160751755de703---47864194141.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7aa27a2af---sevurepajuwabowusa.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/4143809307.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_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001068f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068F 17160 bytes
SHA-256: a039d1965899b64698f7a4c3d1819f5040526e08b0dabf7299925f115ad4cdfe
font_02_sfnt_off00013301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13301 10832 bytes
SHA-256: acf5abce400223a5c957f47ba232f1f8dbb7e5f41e570af8361accf8b8a2bb9c

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