Malicious PDF — malware analysis report

Static analysis result for SHA-256 26eaf1bc7ff30af8…

MALICIOUS

PDF

91.5 KB Created: 2021-06-28 17:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2bc8469510831a58190825ec324ae5c5 SHA-1: 022d4df43c3055c24fc82df8a090e51d0e06cbeb SHA-256: 26eaf1bc7ff30af83af0ca97b3e5d63e325c675e1cffbab3fd121093b4ab81f7
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous links to PDF files hosted on various domains, combined with heuristics indicating a link farm and a download button lure, suggests a phishing or social engineering attack. The document likely aims to trick users into downloading a malicious payload disguised as a legitimate file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bhttourist.com/upload/fckimagesfile/divun.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/a5a29csfh3at4nbii4cja8nijp/vezuradataxi.pdf
    • http://aihyang.com/userfiles/file/devuzaxewedurijoja.pdf
    • http://toonesk.com/upload/tudizevekurunopulaxozo.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/64u5dofir0g9ubhng16coiv1bd/nonapekomikiredajuj.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/26320f7322e0ed60f48847ec9d052ee9/jabiserugavirazoxo.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0qeu8n409b9sni7632a1rm4aik/99669881037.pdf
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/faxusu.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089929aa8773---69597350382.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608a607443268---lerekuzosiguwazif.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/73c1b0fc9bf673232b840fd436c53e9e/votuloxofusufitoso.pdf
    • https://audit-advisers.com/userfiles/file/83037652017.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb86e6e0ee0---52155745807.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/lu9epmo2160e1t5ab81m9d4776/dorarobivogufejewujuserer.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/helh49f04g4jkterknqnjmp5p7/26180414409.pdf
    • https://toskov-yordanov.com/userfiles/file/98241972457.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77e4f7567f---8924351501.pdf
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49200848985.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e6008a404e998ee7698322bfb72eaa02/xatofirenizetuzirawu.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608207c9b84f2---pixavijuwozupusojagu.pdf
    • https://lessonskg.com/userfiles/file/15719805156.pdf
    • https://medtek.vn/storage/file/71868376512.pdf
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/damolu.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743ce2f3eff---55657703027.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8837b79a8---35047326340.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hsk+standard+course+5+pdf+free+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1d1.bin
1bba33582957019feb6189f0a0067214beb559c538d7fe8c8762652423f174f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D1 3756 bytes
font_01_sfnt_off0000f059.bin
07411def9c4915850f0ce58c001a3b866a8684a0adb0778a9c1e653e1e208601
pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 10924 bytes
font_02_sfnt_off000109e9.bin
b0103c10ac88ae1539256bb6d7689df6a29dab3cec0ea42d6a6af5dc92005947
pdf-font-stream PDF embedded font (sfnt) at offset 0x109E9 30508 bytes
font_03_sfnt_off00014645.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14645 16792 bytes